Liquid crystal composition and liquid crystal display device using the same

ABSTRACT

There is provided a liquid crystal composition containing a compound represented by General Formula (i) (where R i  represents an alkyl group having 1 to 5 carbon atoms) and a compound represented by Formula (ii), and there is also provided a liquid crystal display device using such a liquid crystal composition.

TECHNICAL FIELD

The present invention relates to a nematic liquid crystal composition which is useful as a material for a liquid crystal display and which has a positive dielectric anisotropy (Δ∈), and the present invention also relates to a liquid crystal display device using such a nematic liquid crystal composition.

BACKGROUND ART

Liquid crystal display devices have been applied to, for example, watches, calculators, a variety of measuring equipment, panels used in automobiles, word processors, electronic notebooks, printers, computers, television sets, clocks, and advertising boards. Representative examples of types of liquid crystal display devices include a TN (twisted nematic) type, an STN (super twisted nematic) type, and a VA (vertical alignment) type and IPS (in-plane switching) type involving use of a TFT (thin film transistor). Liquid crystal compositions used in such liquid crystal display devices need to satisfy the following requirements: being stable to external elements such as moisture, air, heat, and light; having a liquid crystal phase in a wide temperature range mainly including room temperature as much as possible; having a low viscosity; and enabling a low driving voltage. In addition, liquid crystal compositions are composed of several to tens of compounds to adjust, for example, the dielectric anisotropy (Δ∈) and/or refractive index anisotropy (Δn) to be optimum to individual display devices.

A liquid crystal composition having a negative Δ∈ is used in vertical alignment (VA)-type displays, and a liquid crystal composition having a positive Δ∈ is used in horizontal alignment-type displays such as a TN type, an STN type, and an IPS (in-plane switching) type. Another type of driving has been reported, in which molecules of a liquid crystal composition having a positive Δ∈ are vertically aligned in a state in which voltage is not applied, and then a horizontal electric field is applied for performing display. A demand for a liquid crystal composition having a positive Δ∈ has therefore further increased. In all types of driving, however, there have been demands for low driving voltage, a quick response, and a broad range of operation temperature. In other words, a liquid crystal composition having a positive Δ∈ with a large absolute value, a low viscosity (η), and a high nematic phase-isotropic liquid phase transition temperature (Tni) has been demanded. In order to control Δn×d that is a product of Δn and a cell gap (d) to be a predetermined value, the Δn of a liquid crystal composition needs to be adjusted to be in a proper range on the basis of the cell gap. In addition, a quick response is important in liquid crystal display devices applied to television sets or other apparatuses, which generates a need for a liquid crystal composition having a small rotational viscosity (γ1).

Liquid crystal compositions which enable a quick response have been disclosed; for example, such liquid crystal compositions contain a combination of a liquid crystal compound having a positive Δ∈ and represented by Formula (A-1) or (A-2) and a liquid crystal compound having a neutral Δ∈ and represented by Formula (B). In these liquid crystal compositions, the liquid crystal compound having a positive Δ∈ has a —CF₂O— moiety, and the liquid crystal compound having a neutral Δ∈ has an alkenyl group, which is widely known in the field of liquid crystal compositions (see Patent Literatures 1 to 4).

As liquid crystal display devices have come to be used in a broad range of applications, usage and manufacturing thereof have been greatly changed. In order to adapt to such changes, optimization of characteristics other than known basic physical properties has been needed. In particular, a VA type and an IPS type have become popular as liquid crystal display devices utilizing a liquid crystal composition, and this type of display devices even having a very large size (e.g., 50 inches or lager) have been practically used. An increase in the size of substrates has changed a technique for putting a liquid crystal composition between substrates, and a one-drop-fill (ODF) technique has become mainstream in place of a typically employed vacuum injection technique. Dropping of a liquid crystal composition onto a substrate, however, generates droplet stains with the result that display quality is degraded, which has been problematic.

Furthermore, in a process for manufacturing a liquid crystal display device by an ODF technique, a liquid crystal composition needs to be dropped in an amount optimum for the size of the liquid crystal display device. In the case where the amount of a liquid crystal composition to be dropped largely varies from the optimum level, a predetermined balance between a refractive index and a driving electric field in a liquid crystal display device is disrupted, which causes defective display, such as unevenness and defective contrast. In particular, the optimum amount of a liquid crystal composition to be dropped is small in small-size liquid crystal display devices widely used in smartphones which have become popular in recent years, and thus it is difficult even to control a variation from the optimum amount to be in a certain range. Hence, in order to maintain a high production yield of liquid crystal display devices, for instance, a liquid crystal composition needs to be less affected by impact and a rapid pressure change generated on dropping of the liquid crystal composition in a dropping apparatus and to continuously and stably dropped for a long time.

In terms of these circumstances, a liquid crystal composition which is used in active-matrix liquid crystal display devices driven by, for example, a TFT device needs to be developed for satisfying the following requirements in view of a manufacturing process of liquid crystal display devices: enabling the quick response needed for liquid crystal display devices and having a high specific resistance, high voltage holding ratio, and improved stability to external elements such as light and heat.

CITATION LIST Patent Literature

-   PTL 1: Japanese Unexamined Patent Application Publication No.     2008-037918 -   PTL 2: Japanese Unexamined Patent Application Publication No.     2008-038018 -   PTL 3: Japanese Unexamined Patent Application Publication No.     2010-275390 -   PTL 4: Japanese Unexamined Patent Application Publication No.     2011-052120

SUMMARY OF INVENTION Technical Problem

It is an object of the present invention to provide a liquid crystal composition which has a positive Δ∈, a liquid crystal phase in a wide temperature range, a low viscosity, a good resistance to resolution at low temperature, a high specific resistance, and a high voltage holding ratio and which is stable to heat and light. It is another object of the present invention to enable high-yield production of a liquid crystal display device in which use of this liquid crystal composition gives excellent display quality with a reduction in defective display brought about by screen burn-in and droplet stains. It is another object of the present invention to provide a liquid crystal display device using such a liquid crystal composition.

Solution to Problem

The present invention includes the following aspects.

(1) A liquid crystal composition having a positive dielectric anisotropy, the composition containing at least one compound represented by General Formula (i) and a compound represented by Formula (ii).

In General Formula (i), R^(i) represents an alkyl group having 1 to 5 carbon atoms.

(2) The liquid crystal composition according to the aspect (1), wherein the amount of the compound represented by Formula (ii) is at least 14 mass % relative to the total mass of the liquid crystal composition.

(3) The liquid crystal composition according to any one of the aspects (1) and (2), wherein a compound represented by Formula (i.4) is used as the at least one compound represented by General Formula (i), and the amount of the compound represented by Formula (i.4) is at least 8 mass % relative to the total mass of the liquid crystal composition.

(4) The liquid crystal composition according to any one of the aspects (1) to (3), further containing at least one compound represented by General Formula (L).

[Chem. 5] R^(L1)—B^(L1)-L^(L1)-B^(L2)

L^(L2)-B^(L3)

_(OL)R^(L2)  (L)

In General Formula (L),

R^(L1) and R^(L2) each independently represent an alkyl group having 1 to 8 carbon atoms, and one —CH₂— moiety or at least two —CH₂— moieties not adjoining each other in the alkyl group are each independently optionally substituted with —CH═CH—, —C≡C—, —O—, —CO—, —COO—, or —OCO—;

OL represents 0, 1, 2, or 3;

B^(L1), B^(L2), and B^(L3) each independently represent a group selected from the group consisting of

(a) a 1,4-cyclohexylene group (of which one —CH₂— moiety or at least two —CH₂— moieties not adjoining each other are optionally substituted with —O—) and

(b) a 1,4-phenylene group (of which one —CH═ moiety or at least two —CH═ moieties not adjoining each other are optionally substituted with —N═), and

the groups (a) and (b) are each independently optionally substituted with a cyano group, a fluorine atom, or a chlorine atom;

L^(L1) and L^(L2) each independently represent a single bond, —CH₂CH₂—, —(CH₂)₄—, —OCH₂—, —CH₂O—, —COO—, —OCO—, —OCF₂—, —CF₂O—, —CH═N—N═CH—, —CH═CH—, —CF═CF—, or —C≡C—;

in the case where OL is 2 or 3 and where L^(L2) is multiple, the L^(L2) moieties are the same as or different from each other; in the case where OL is 2 or 3 and where B^(L3) is multiple, the B^(L3) moieties are the same as or different from each other; and the compound represented by General Formula (L) excludes the compound represented by Formula (ii).

(5) The liquid crystal composition according to any one of the aspects (1) to (4), further containing at least one compound represented by General Formula (M).

In General Formula (M),

R^(M1) represents an alkyl group having 1 to 8 carbon atoms, and one —CH₂— moiety or at least two —CH₂— moieties not adjoining each other in the alkyl group are each independently optionally substituted with —CH═CH—, —C≡C—, —O—, —CO—, —COO—, or —OCO—;

PM represents 0, 1, 2, 3, or 4;

C^(M1) and C^(M2) each independently represent a group selected from the group consisting of

(d) a 1,4-cyclohexylene group (of which one —CH₂— moiety or at least two —CH₂— moieties not adjoining each other are optionally substituted with —O— or —S—) and

(e) a 1,4-phenylene group (of which one —CH═ moiety or at least two —CH═ moieties not adjoining each other are optionally substituted with —N═), and

the groups (d) and (e) are each independently optionally substituted with a cyano group, a fluorine atom, or a chlorine atom;

K^(M1) and K^(M2) each independently represent a single bond, —CH₂CH₂—, —(CH₂)₄—, —OCH₂—, —CH₂O—, —OCF₂—, —CF₂O—, —COO—, —OCO—, or —C≡C—;

in the case where PM is 2, 3, or 4 and where K^(M1) is multiple, the K^(M1) moieties are the same as or different from each other; in the case where PM is 2, 3, or 4 and where C^(M2) is multiple, the C^(M2) moieties are the same as or different from each other;

X^(M1) and X^(M3) each independently represent a hydrogen atom, a chlorine atom, or a fluorine atom;

X^(M2) represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group; and the compound represented by General Formula (M) excludes the compound represented by General Formula (i).

(6) The liquid crystal composition according to any one of the aspects (4) and (5), wherein at least one compound represented by General Formula (II-2) is used as the at least one compound represented by General Formula (L).

In General Formula (II-2), R²³ represents an alkenyl group having 2 to 5 carbon atoms, and R²⁴ represents an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms.

(7) The liquid crystal composition according to the aspect (6), wherein a compound represented by Formula (11.2) is used as the at least one compound represented by General Formula (II-2), and the amount of the compound represented by Formula (11.2) is at least 13 mass % relative to the total mass of the liquid crystal composition.

(8) The liquid crystal composition according to any one of the aspects (5) to (7), wherein at least one compound represented by General Formula (IX-2-2) is used as the at least one compound represented by General Formula (M).

In General Formula (IX-2-2), R⁹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

(9) The liquid crystal composition according to the aspect (8), wherein a compound represented by Formula (31.2) is used as the at least one compound represented by General Formula (IX-2-2), and the amount of the compound represented by Formula (31.2) is at least 9 mass % relative to the total mass of the liquid crystal composition.

(10) The liquid crystal composition according to any one of the aspects (8) and (9), wherein a compound represented by Formula (31.4) is used as the at least one compound represented by General Formula (IX-2-2).

(11) The liquid crystal composition according to any one of the aspects (5) to (10), wherein at least one compound represented by General Formula (X-2-1) is used as the at least one compound represented by General Formula (M).

In General Formula (X-2-1), R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

(12) The liquid crystal composition according to the aspect (11), wherein a compound represented by Formula (39.2) is used as the at least one compound represented by General Formula (X-2-1).

(13) The liquid crystal composition according to any one of the aspects (4) to (12), wherein at least one compound selected from the group consisting of compounds represented by Formulae (19.1) and (19.2) is used as the at least one compound represented by General Formula (L), and the amount of the selected compound is 0.5 mass % or more and less than 5 mass % relative to the total mass of the liquid crystal composition.

(14) The liquid crystal composition according to any one of the aspects (4) to (13), wherein at least one compound selected from the group consisting of compounds represented by Formulae (18.4) and (18.5) is used as the at least one compound represented by General Formula (L), and the amount of the selected compound is at least 7 mass % relative to the total mass of the liquid crystal composition.

(15) The liquid crystal composition according to any one of the aspects (4) to (14), wherein a compound represented by Formula (18.3) is used as the at least one compound represented by General Formula (L).

(16) The liquid crystal composition according to any one of the aspects (4) to (15), wherein at least one compound selected from the group consisting of compounds represented by Formulae (18.6) and (18.7) is used as the at least one compound represented by General Formula (L), and the amount of the selected compound is at least 9 mass % relative to the total mass of the liquid crystal composition.

(17) The liquid crystal composition according to any one of the aspects (4) to (16), wherein at least one compound selected from the group consisting of compounds represented by Formulae (19.3) and (19.4) is used as the at least one compound represented by General Formula (L), and the amount of the selected compound is at least 6 mass % relative to the total mass of the liquid crystal composition.

(18) The liquid crystal composition according to any one of the aspects (4) to (17), wherein at least one compound selected from the group consisting of compounds represented by Formulae (19.9) and (19.10) is used as the at least one compound represented by General Formula (L), and the amount of the selected compound is 0.5 mass % or more and less than 5 mass % relative to the total mass of the liquid crystal composition.

(19) The liquid crystal composition according to any one of the aspects (4) to (18), wherein at least one compound represented by General Formula (III) is used as the at least one compound represented by General Formula (L).

In General Formula (III), R³¹ and R³² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

(20) The liquid crystal composition according to the aspect (19), wherein a compound represented by Formula (15.1) is used as the at least one compound represented by General Formula (III), and the amount of the compound represented by Formula (15.1) is at least 6 mass % relative to the total mass of the liquid crystal composition.

(21) The liquid crystal composition according to any one of the aspects (5) to (20), wherein at least one compound represented by General Formula (X-3-1) is used as the at least one compound represented by General Formula (M).

In General Formula (X-3-1), R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

(22) The liquid crystal composition according to the aspect (21), wherein a compound represented by Formula (41.2) is used as the at least one compound represented by General Formula (X-3-1), and the amount of the compound represented by Formula (41.2) is 0.5 mass % or more and less than 2 mass % relative to the total mass of the liquid crystal composition.

(23) The liquid crystal composition according to any one of the aspects (4) to (22), wherein at least one compound represented by General Formula (I-4) is used as the at least one compound represented by General Formula (L).

In General Formula (I-4), R¹¹ and R¹² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 or 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

(24) The liquid crystal composition according to the aspect (23), wherein a compound represented by Formula (5.2) is used as the at least one compound represented by General Formula (I-4).

(25) The liquid crystal composition according to any one of the aspects (23) and (24), wherein a compound represented by Formula (5.3) is used as the at least one compound represented by General Formula (I-4), and the amount of the compound represented by Formula (5.3) is at least 5 mass % relative to the total mass of the liquid crystal composition.

(26) The liquid crystal composition according to any one of the aspects (5) to (25), wherein at least one compound represented by General Formula (XIV-2-2) is used as the at least one compound represented by General Formula (M).

In General Formula (XIV-2-2), R¹⁴⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

(27) The liquid crystal composition according to the aspect (26), wherein a compound represented by Formula (54.2) is used as the at least one compound represented by General Formula (XIV-2-2).

(28) The liquid crystal composition according to any one of the aspects (26) and (27), wherein a compound represented by Formula (54.1) is used as the at least one compound represented by General Formula (XIV-2-2).

(29) The liquid crystal composition according to any one of the aspects (26) to (28), wherein a compound represented by Formula (54.4) is used as the at least one compound represented by General Formula (XIV-2-2).

(30) The liquid crystal composition according to any one of the aspects (5) to (29), wherein at least one compound represented by General Formula (XIV-1) is used as the at least one compound represented by General Formula (M).

In General Formula (XIV-1), R¹⁴⁰ represents an alkyl group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, or an alkoxy group having 1 to 7 carbon atoms; and Y¹⁴ represents a fluorine atom, a chlorine atom, or —OCF₃.

(31) The liquid crystal composition according to the aspect (30), wherein a compound represented by Formula (51.1) is used as the at least one compound represented by General Formula (XIV-1), and the amount of the compound represented by Formula (51.1) is at least 5 mass % relative to the total mass of the liquid crystal composition.

(32) The liquid crystal composition according to any one of the aspects (4) to (31), wherein at least one compound represented by General Formula (I-2) is used as the at least one compound represented by General Formula (L).

In General Formula (I-2), R¹³ and R¹⁴ each independently represent an alkyl group having 1 to 5 carbon atoms.

(33) The liquid crystal composition according to the aspect (32), wherein a compound represented by Formula (3.3) is used as the at least one compound represented by General Formula (I-2), and the amount of the compound represented by Formula (3.3) is 0.5 mass % or more and less than 5 mass % relative to the total mass of the liquid crystal composition.

(34) The liquid crystal composition according to any one of the aspects (4) to (33), wherein at least one compound represented by General Formula (I-5) is used as the at least one compound represented by General Formula (L).

In General Formula (I-5), R¹¹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; and R¹² represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 or 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

(35) The liquid crystal composition according to the aspect (34), wherein a compound represented by Formula (6.3) is used as the at least one compound represented by General Formula (I-5), and the amount of the compound represented by Formula (6.3) is at least 8 mass % relative to the total mass of the liquid crystal composition.

(36) The liquid crystal composition according to any one of the aspects (34) and (35), wherein a compound represented by Formula (6.6) is used as the at least one compound represented by General Formula (I-5).

(37) The liquid crystal composition according to any one of the aspects (4) to (36), wherein at least one compound represented by General Formula (I-7) is used as the at least one compound represented by General Formula (L).

In General Formula (I-7), R¹¹ and R¹² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; and X¹² represents a fluorine atom or a chlorine atom.

(38) The liquid crystal composition according to the aspect (37), wherein a compound represented by Formula (8.1) is used as the at least one compound represented by General Formula (I-7).

(39) The liquid crystal composition according to any one of the aspects (4) to (38), wherein at least one compound represented by General Formula (II-1) is used as the at least one compound represented by General Formula (L).

In General Formula (II-1), R²¹ and R²² each independently represent an alkenyl group having 2 to 5 carbon atoms, an alkyl group having 1 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

(40) The liquid crystal composition according to the aspect (39), wherein a compound represented by Formula (10.1) is used as the at least one compound represented by General Formula (II-1).

(41) The liquid crystal composition according to any one of the aspects (5) to (40), wherein at least one compound represented by General Formula (IX-1-1) is used as the at least one compound represented by General Formula (M).

In General Formula (IX-1-1), R⁹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

(42) The liquid crystal composition according to the aspect (41), wherein a compound represented by Formula (28.5) is used as the at least one compound represented by General Formula (IX-1-1).

(43) The liquid crystal composition according to any one of the aspects (5) to (42), wherein at least one compound represented by General Formula (X-1-3) is used as the at least one compound represented by General Formula (M).

In General Formula (X-1-3), R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

(44) The liquid crystal composition according to the aspect (43), wherein a compound represented by Formula (38.2) is used as the at least one compound represented by General Formula (X-1-3).

(45) The liquid crystal composition according to any one of the aspects (5) to (44), wherein at least one compound represented by General Formula (X-4-1) is used as the at least one compound represented by General Formula (M).

In General Formula (X-4-1), R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

(46) The liquid crystal composition according to the aspect (45), wherein a compound represented by Formula (42.3) is used as the at least one compound represented by General Formula (X-4-1).

(47) A liquid crystal display device using the liquid crystal composition according to any one of the aspects (1) to (46).

(48) The liquid crystal display device according to the aspect (47), wherein the liquid crystal display device is operated in an IPS mode.

(49) The liquid crystal display device according to the aspect (47), wherein the liquid crystal display device is operated in an OCB mode.

(50) The liquid crystal display device according to the aspect (47), wherein the liquid crystal display device is operated in an ECB mode.

(51) The liquid crystal display device according to the aspect (47), wherein the liquid crystal display device is operated in a VA mode.

(52) The liquid crystal display device according to the aspect (47), wherein the liquid crystal display device is operated in a VA-IPS mode.

(53) The liquid crystal display device according to the aspect (47), wherein the liquid crystal display device is operated in an FFS mode.

(54) A liquid crystal display including the liquid crystal display device according to any one of the aspects (47) to (53).

Advantageous Effects of Invention

The composition having a positive dielectric anisotropy according to the present invention has a significantly improved resistance to resolution at low temperature while the low viscosity, high specific resistance, and high voltage holding ratio thereof are maintained; in addition, the composition can be stably and continuously dropped for a long time in a process of manufacturing a liquid crystal display device by an ODF technique. Hence, the composition of the present invention enables high-yield production of liquid crystal display devices having an excellent display quality with a reduction in defective display resulting from the production process thereof and is therefore highly practical (adaptable) for application to products involving liquid crystal; liquid crystal display devices using this composition, such as IPS (in-plane switching) type and an FFS (fringe-field switching), can quickly respond.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a cross-sectional view illustrating a liquid crystal display device according to an embodiment of the present invention; a substrate including members 100 to 105 is referred to as “backplane”, and a substrate including members including 200 to 205 is referred to as “frontplane”.

FIG. 2 illustrates an exposure process in which a pattern for forming columnar spacers above a black matrix is employed as the pattern of a photomask.

DESCRIPTION OF EMBODIMENTS

The liquid crystal composition of the present invention has a positive dielectric anisotropy and contains a compound represented by General Formula (i) and a compound represented by Formula (ii). Such a liquid crystal composition will now be described; the term “%” herein refers to “mass %” unless otherwise specified. The preferred amount of each compound is an example of the preferred content thereof in the liquid crystal composition (except for the case in which the lower limit of the amount is 0 mass %).

In General Formula (i), R^(i) represents an alkyl group having 1 to 5 carbon atoms.

In the liquid crystal composition, the amount of the compound represented by General Formula (i) is not particularly limited but preferably not less than 1 mass %, also preferably not less than 2 mass %, also preferably not less than 4 mass %, also preferably not less than 5 mass %, also preferably not less than 10 mass %, also preferably not less than 13 mass %, also preferably not less than 15 mass %, also preferably not less than 16 mass %, also preferably not less than 18 mass %, and also preferably not less than 20 mass % relative to the total mass of the liquid crystal composition. In view of resistance to resolution at low temperature, nematic phase-isotropic liquid phase transition temperature, electric reliability, and another property, the amount of the compound represented by General Formula (i) in the liquid crystal composition is also preferably not more than 35 mass %, also preferably not more than 30 mass %, also preferably not more than 25 mass %, also preferably not more than 22 mass %, also preferably not more than 20 mass %, also preferably not more than 18 mass %, also preferably not more than 16 mass %, also preferably not more than 15 mass %, also preferably not more than 13 mass %, also preferably not more than 10 mass %, also preferably not more than 5 mass %, and also preferably not more than 4 mass % relative to the total mass of the liquid crystal composition. In particular, the amount of the compound represented by General Formula (i) in the liquid crystal composition is preferably in the range of 1 to 35 mass %, also preferably 2 to 35 mass %, also preferably 4 to 35 mass %, also preferably 5 to 35 mass %, also preferably 10 to 35 mass %, also preferably 13 to 35 mass %, also preferably 16 to 35 mass %, also preferably 18 to 35 mass %, also preferably 20 to 35 mass %, also preferably 1 to 30 mass %, also preferably 1 to 25 mass %, also preferably 1 to 22 mass %, also preferably 1 to 20 mass %, also preferably 1 to 18 mass %, also preferably 1 to 16 mass %, also preferably 1 to 13 mass %, also preferably 1 to 10 mass %, also preferably 1 to 5 mass %, also preferably 1 to 3 mass %, also preferably 4 to 5 mass %, also preferably 5 to 10 mass %, also preferably 10 to 15 mass %, also preferably 13 to 20 mass %, and also preferably 18 to 22 mass % relative to the total mass of the liquid crystal composition of the present invention.

In terms of a response speed and electrical and optical reliabilities, the amount of the compound represented by Formula (ii) in the liquid crystal composition is preferably not less than 1 mass %, also preferably not less than 2 mass %, also preferably not less than 4 mass %, also preferably not less than 5 mass %, also preferably not less than 7 mass %, also preferably not less than 8 mass %, also preferably not less than 9 mass %, also preferably not less than 10 mass %, also preferably not less than 11 mass %, also preferably not less than 12 mass %, also preferably not less than 13 mass %, also preferably not less than 14 mass %, also preferably not less than 15 mass %, and also preferably not less than 16 mass % relative to the total mass of the liquid crystal composition of the present invention.

The amount of the compound represented by Formula (ii) in the liquid crystal composition is also preferably not more than 40 mass %, also preferably not more than 35 mass %, also preferably not more than 30 mass %, also preferably not more than 16 mass %, also preferably not more than 14 mass %, also preferably not more than 11 mass %, also preferably not more than 9 mass %, also preferably not more than 7 mass %, also preferably not more than 5 mass %, and also preferably not more than 4 mass % relative to the total mass of the liquid crystal composition of the present invention.

In particular, it is preferred that the amount of the compound represented by Formula (ii) in the liquid crystal composition be at least 14 mass % relative to the total mass of the liquid crystal composition of the present invention.

The amount of the compound represented by Formula (ii) in the liquid crystal composition is preferably in the range of 1 to 35 mass %, also preferably 1 to 30 mass %, also preferably 1 to 20 mass %, also preferably 11 to 35 mass %, also preferably 11 to 30 mass %, also preferably 11 to 20 mass %, also preferably 14 to 35 mass %, also preferably 14 to 30 mass %, and also preferably 14 to 20 mass % relative to the total mass of the liquid crystal composition of the present invention.

The total amount of the compound represented by General Formula (i) and the compound represented by Formula (ii) is preferably not less than 2 mass %, also preferably not less than 5 mass %, also preferably not less than 7 mass %, also preferably not less than 9 mass %, also preferably not less than 11 mass %, also preferably not less than 13 mass %, also preferably not less than 15 mass %, also preferably not less than 18 mass %, also preferably not less than 20 mass %, also preferably not less than 24 mass %, and also preferably not less than 25 mass % relative to the total mass of the liquid crystal composition. The total amount of the compound represented by General Formula (i) and the compound represented by Formula (ii) is also preferably not more than 50 mass %, also preferably not more than 45 mass %, also preferably not more than 40 mass %, also preferably not more than 38 mass %, also preferably not more than 36 mass %, also preferably not more than 32 mass %, also preferably not more than 30 mass %, also preferably not more than 28 mass %, also preferably not more than 25 mass %, also preferably not more than 23 mass %, also preferably not more than 21 mass %, also preferably not more than 18 mass %, and also preferably not more than 9 mass % relative to the total mass of the liquid crystal composition. In particular, the total amount of the compound represented by General Formula (i) and the compound represented by Formula (ii) is preferably in the range of 2 to 9 mass %, also preferably 5 to 45 mass %, also preferably 5 to 25 mass %, also preferably 7 to 45 mass %, also preferably 7 to 23 mass %, also preferably 9 to 21 mass %, also preferably 10 to 18 mass %, also preferably 11 to 32 mass %, also preferably 13 to 30 mass %, also preferably 15 to 40 mass %, also preferably 15 to 28 mass %, also preferably 18 to 38 mass %, also preferably 20 to 36 mass %, also preferably 24 to 45 mass %, also preferably 24 to 40 mass %, also preferably 24 to 30 mass %, also preferably 25 to 50 mass %, also preferably 25 to 40 mass %, and also preferably 25 to 30 mass % relative to the total mass of the liquid crystal composition.

The liquid crystal composition of the present invention contains at least one compound represented by General Formula (i). In the case where two or more compounds represented by General Formula (i) are used, a proper combination thereof is determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence.

In particular, the compound represented by General Formula (i), which is used in the liquid crystal composition of the present invention, is preferably at least one compound selected from the group consisting of compounds represented by Formulae (i.1) to (i.4); among these, at least one compound selected from the group consisting of the compounds represented by Formulae (i.2) to (i.4) is preferably employed, and the compound represented by Formula (i.4) is more preferably employed.

In the liquid crystal composition of the present invention, the amount of the compound represented by Formula (i.4) is preferably from 1 mass % to 30 mass %, also preferably from 1 mass % to 25 mass %, also preferably from 1 mass % to 20 mass %, also preferably from 1 mass % to 15 mass %, also preferably 1 mass % or more and less than 7 mass %, also preferably from 8 mass % to 30 mass %, also preferably from 8 mass % to 25 mass %, also preferably from 8 mass % to 20 mass %, and also preferably from 8 mass % to 15 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property. In particular, it is preferred that the lower limit of the amount of the compound represented by Formula (i.4) be 8 mass % relative to the total mass of the liquid crystal composition of the present invention.

In the case where the liquid crystal composition contains three compounds represented by General Formula (i), the total amount of the compounds represented by General Formula (i) is preferably in the range of 5 to 30 mass %, more preferably 9 to 26 mass %, and further preferably 18 to 26 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition contains two compounds represented by General Formula (i), the total amount of the compounds represented by General Formula (i) is preferably in the range of 1 to 20 mass %, more preferably 1 to 15 mass %, and further preferably 1 to 10 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition contains three compounds represented by General Formula (i), the total amount of the compounds represented by General Formula (i) and the compound represented by Formula (ii) preferably ranges from 20 to 45 mass %, more preferably 24 to 45 mass %, and further preferably 24 to 40 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition contains two compounds represented by General Formula (i), the total amount of the compounds represented by General Formula (i) and the compound represented by Formula (ii) preferably is from 10 to 40 mass % relative to the total mass of the liquid crystal composition; in an embodiment of the present invention, the total amount is more preferably from 12 to 17 mass %; and in another embodiment of the present invention, the total amount is more preferably from 25 to 35 mass %.

The liquid crystal composition of the present invention can further contain at least one compound represented by General Formula (L).

[Chem. 56] R^(L1)—B^(L1)-L^(L1)-B^(L2)

L^(L2)-B^(L3)

_(OL)R^(L2)  (L)

In General Formula (L), R^(L1) and R^(L2) each independently represent an alkyl group having 1 to 8 carbon atoms, and one —CH₂— moiety or at least two —CH₂— moieties not adjoining each other in the alkyl group are each independently optionally substituted with —CH═CH—, —C≡C—, —O—, —CO—, —COO—, or —OCO—;

OL represents 0, 1, 2, or 3;

B^(L1), B^(L2), and B^(L3) each independently represent a group selected from the group consisting of

(a) a 1,4-cyclohexylene group (of which one —CH₂— moiety or at least two —CH₂— moieties not adjoining each other are optionally substituted with —O—) and

(b) a 1,4-phenylene group (of which one —CH═ moiety or at least two —CH═ moieties not adjoining each other are optionally substituted with —N═), and

at least one hydrogen atom in each of the groups (a) and (b) is independently optionally substituted with a cyano group, a fluorine atom, or a chlorine atom;

L^(L1) and L^(L2) each independently represent a single bond, —CH₂CH₂—, —(CH₂)₄—, —OCH₂—, —CH₂O—, —COO—, —OCO—, —OCF₂—, —CF₂O—, —CH═N—N═CH—, —CH═CH—, —CF═CF—, or —C≡C—;

in the case where OL is 2 or 3 and where L^(L2) is multiple, the L^(L2) moieties are the same as or different from each other;

in the case where OL is 2 or 3 and where B^(L3) is multiple, the B^(L3) moieties are the same as or different from each other; and

the compound represented by General Formula (L) excludes the compound represented by Formula (ii).

Such compounds can be used in any combination; a combination of the compounds are properly determined on the basis of predetermined properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence (refractive index anisotropy). In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two of the compounds are used. In another embodiment of the present invention, three of the compounds are used. In another embodiment of the present invention, four of the compounds are used. In another embodiment of the present invention, five of the compounds are used. In another embodiment of the present invention, six of the compounds are used. In another embodiment of the present invention, seven of the compounds are used. In another embodiment of the present invention, eight of the compounds are used. In another embodiment of the present invention, nine of the compounds are used. In another embodiment of the present invention, ten or more of the compounds are used.

In the liquid crystal composition of the present invention, the amount of the compound represented by General Formula (L) needs to be appropriately adjusted on the basis of intended properties such as resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, process adaptability, resistance to droplet stains and screen burn-in, and dielectric anisotropy.

Relative to the total mass of the liquid crystal composition of the present invention, for instance, the amount of the compound represented by General Formula (L) is in the range of 20 to 90 mass % in an embodiment of the present invention; in another embodiment of the present invention, the amount is from 20 to 85 mass %; in another embodiment of the present invention, the amount is from 20 to 80 mass %; in another embodiment of the present invention, the amount is from 25 to 80 mass %; in another embodiment of the present invention, the amount is from 30 to 80 mass %; in another embodiment of the present invention, the amount is from 35 to 80 mass %; in another embodiment of the present invention, the amount is from 37 to 80 mass %; in another embodiment of the present invention, the amount is from 41 to 80 mass %; in another embodiment of the present invention, the amount is from 44 to 80 mass %; in another embodiment of the present invention, the amount is from 47 to 80 mass %; in another embodiment of the present invention, the amount is from 49 to 80 mass %; in another embodiment of the present invention, the amount is from 51 to 80 mass %; in another embodiment of the present invention, the amount is from 54 to 80 mass %; in another embodiment of the present invention, the amount is from 56 to 80 mass %; in another embodiment of the present invention, the amount is from 58 to 80 mass %; in another embodiment of the present invention, the amount is from 63 to 80 mass %; in another embodiment of the present invention, the amount is from 65 to 80 mass %; in another embodiment of the present invention, the amount is from 69 to 80 mass %; in another embodiment of the present invention, the amount is from 71 to 80 mass %; in another embodiment of the present invention, the amount is from 74 to 80 mass %; in another embodiment of the present invention, the amount is from 35 to 78 mass %; in another embodiment of the present invention, the amount is from 35 to 74 mass %; in another embodiment of the present invention, the amount is from 35 to 71 mass %; in another embodiment of the present invention, the amount is from 35 to 69 mass %; in another embodiment of the present invention, the amount is from 35 to 66 mass %; in another embodiment of the present invention, the amount is from 35 to 63 mass %; in another embodiment of the present invention, the amount is from 35 to 58 mass %; in another embodiment of the present invention, the amount is from 35 to 56 mass %; in another embodiment of the present invention, the amount is from 35 to 54 mass %; in another embodiment of the present invention, the amount is from 35 to 52 mass %; in another embodiment of the present invention, the amount is from 35 to 49 mass %; in another embodiment of the present invention, the amount is from 47 to 78 mass %; in another embodiment of the present invention, the amount is from 44 to 78 mass %; and in another embodiment of the present invention, the amount is from 41 to 78 mass %.

In the case where the viscosity of the liquid crystal composition of the present invention needs to be kept at a low level for allowing the liquid crystal composition to contribute to a high response speed, it is preferred that the lower limit of the above-mentioned range be high and that the upper limit thereof be high. In the case where the Tni of the liquid crystal composition of the present invention needs to be kept at a high level to allow the liquid crystal composition to have a high temperature stability, it is preferred that the lower limit of the above-mentioned range be high and that the upper limit thereof be high. In order to increase dielectric anisotropy for keeping driving voltage at a low level, it is preferred that the lower limit of the above-mentioned range be low and that the upper limit thereof be low.

In the case where the ring structures bonded to R^(L1) and R^(L2) are phenyl groups (aromatics), R^(L1) and R^(L2) are each preferably a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 (or more) carbon atoms, or an alkenyl group having 4 or 5 carbon atoms; in the case where the ring structures bonded to R^(L1) and R^(L2) are saturated rings such as cyclohexane, pyran, and dioxane, R^(L1) and R^(L2) are each preferably a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy groups having 1 to 4 (or more) carbon atoms, or a linear alkenyl group having 2 to 5 carbon atoms.

In the case where the liquid crystal composition needs to be chemically stable, it is preferred that the molecules of the compound represented by General Formula (L) be free from a chlorine atom.

The compound represented by General Formula (L) is, for example, preferably a compound selected from the group consisting of compounds represented by General Formula (I).

[Chem. 57] R¹¹-A¹¹-A¹²-R¹²  (I)

In General Formula (I), R¹¹ and R¹² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, or an alkenyl group having 2 to 5 carbon atoms; A¹¹ and A¹² each independently represent a 1,4-cyclohexylene group, a 1,4-phenylene group, a 2-fluoro-1,4-phenylene group, or a 3-fluoro-1,4-phenylene group; and the compound represented by General Formula (I) excludes the compound represented by Formula (ii).

Such compounds can be used in any combination; a combination of the compounds are properly determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two of the compounds are used. In another embodiment of the present invention, three of the compounds are used. In another embodiment of the present invention, four of the compounds are used. In another embodiment of the present invention, five of the compounds are used. In another embodiment of the present invention, six or more of the compounds are used.

In the liquid crystal composition of the present invention, the amount of the compound represented by General Formula (I) needs to be appropriately adjusted on the basis of intended properties such as resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, process adaptability, resistance to droplet stains and screen burn-in, and dielectric anisotropy.

Relative to the total mass of the liquid crystal composition of the present invention, for instance, the amount of the compound represented by General Formula (I) is in the range of 3 to 75 mass % in an embodiment of the present invention; in another embodiment of the present invention, the amount is from 3 to 70 mass %; in another embodiment of the present invention, the amount is from 3 to 65 mass %; in another embodiment of the present invention, the amount is from 3 to 60 mass %; in another embodiment of the present invention, the amount is from 7 to 58 mass %; in another embodiment of the present invention, the amount is from 7 to 40 mass %; in another embodiment of the present invention, the amount is from 7 to 35 mass %; in another embodiment of the present invention, the amount is from 7 to 30 mass %; in another embodiment of the present invention, the amount is from 7 to 25 mass %; in another embodiment of the present invention, the amount is from 7 to 21 mass %; in another embodiment of the present invention, the amount is from 20 to 58 mass %; in another embodiment of the present invention, the amount is from 20 to 40 mass %; in another embodiment of the present invention, the amount is from 20 to 25 mass %; in another embodiment of the present invention, the amount is from 25 to 40 mass %; in another embodiment of the present invention, the amount is from 28 to 42 mass %; in another embodiment of the present invention, the amount is from 28 to 39 mass %; in another embodiment of the present invention, the amount is from 28 to 36 mass %; in another embodiment of the present invention, the amount is from 32 to 39 mass %; in another embodiment of the present invention, the amount is from 32 to 34 mass %; in another embodiment of the present invention, the amount is from 34 to 36 mass %; in another embodiment of the present invention, the amount is from 35 to 40 mass %; in another embodiment of the present invention, the amount is from 40 to 49 mass %; and in another embodiment of the present invention, the amount is from 54 to 58 mass %.

In the case where the viscosity of the liquid crystal composition of the present invention needs to be kept at a low level for allowing the liquid crystal composition to contribute to a high response speed, it is preferred that the lower limit of the above-mentioned range be high and that the upper limit thereof be high. In the case where the Tni of the liquid crystal composition of the present invention needs to be kept at a high level to allow the liquid crystal composition to have a high temperature stability, it is preferred that the lower limit of the above-mentioned range be moderate and that the upper limit thereof be moderate. In order to increase dielectric anisotropy for keeping driving voltage at a low level, it is preferred that the lower limit of the above-mentioned range be low and that the upper limit thereof be low.

In the case where the ring structures bonded to R¹¹ and R¹² are phenyl groups (aromatics), R¹¹ and R¹² are each preferably a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, or an alkenyl group having 4 or 5 carbon atoms; in the case where the ring structures bonded to R¹¹ and R¹² are saturated rings such as cyclohexane, pyran, and dioxane, R¹¹ and R¹² are each preferably a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy groups having 1 to 4 carbon atoms, or a linear alkenyl group having 2 to 5 carbon atoms.

The compound represented by General Formula (I) is preferably at least one compound selected from the group consisting of compounds represented by General Formula (I-1).

In General Formula (I-1), R¹¹ and R¹² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, or an alkenyl group having 2 to 5 carbon atoms; and the compound represented by General Formula (I-1) excludes the compound represented by Formula (ii).

Such compounds can be used in any combination; a combination of the compounds are properly determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two of the compounds are used. In another embodiment of the present invention, three of the compounds are used. In another embodiment of the present invention, four of the compounds are used. In another embodiment of the present invention, five or more of the compounds are used.

In the case where the liquid crystal composition of the present invention contains the compound represented by General Formula (I-1), the amount thereof needs to be appropriately adjusted on the basis of intended properties such as resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, process adaptability, resistance to droplet stains and screen burn-in, and dielectric anisotropy.

Relative to the total mass of the liquid crystal composition of the present invention, for instance, the amount of the compound represented by General Formula (I-1) is in the range of 3 to 65 mass % in an embodiment of the present invention; in another embodiment of the present invention, the amount is from 3 to 60 mass %; in another embodiment of the present invention, the amount is from 3 to 55 mass %; in another embodiment of the present invention, the amount is from 3 to 50 mass %; in another embodiment of the present invention, the amount is from 7 to 50 mass %; in another embodiment of the present invention, the amount is from 7 to 45 mass %; in another embodiment of the present invention, the amount is from 7 to 40 mass %; in another embodiment of the present invention, the amount is from 7 to 38 mass %; in another embodiment of the present invention, the amount is from 7 to 35 mass %; in another embodiment of the present invention, the amount is from 7 to 30 mass %; in another embodiment of the present invention, the amount is from 7 to 25 mass %; in another embodiment of the present invention, the amount is from 7 to 21 mass %; in another embodiment of the present invention, the amount is from 7 to 16 mass %; in another embodiment of the present invention, the amount is from 15 to 50 mass %; in another embodiment of the present invention, the amount is from 20 to 50 mass %; in another embodiment of the present invention, the amount is from 25 to 50 mass %; in another embodiment of the present invention, the amount is from 30 to 50 mass %; in another embodiment of the present invention, the amount is from 35 to 50 mass %; in another embodiment of the present invention, the amount is from 40 to 50 mass %; in another embodiment of the present invention, the amount is from 45 to 50 mass %; in another embodiment of the present invention, the amount is from 15 to 34 mass %; in another embodiment of the present invention, the amount is from 15 to 21 mass %; in another embodiment of the present invention, the amount is from 20 to 42 mass %; in another embodiment of the present invention, the amount is from 20 to 35 mass %; in another embodiment of the present invention, the amount is from 20 to 25 mass %; in another embodiment of the present invention, the amount is from 25 to 40 mass %; in another embodiment of the present invention, the amount is from 25 to 36 mass %; in another embodiment of the present invention, the amount is from 25 to 30 mass %; in another embodiment of the present invention, the amount is from 29 to 43 mass %; in another embodiment of the present invention, the amount is from 29 to 35 mass %; in another embodiment of the present invention, the amount is from 32 to 50 mass %; in another embodiment of the present invention, the amount is from 32 to 43 mass %; in another embodiment of the present invention, the amount is from 32 to 38 mass %; in another embodiment of the present invention, the amount is from 34 to 36 mass %; in another embodiment of the present invention, the amount is from 35 to 44 mass %; in another embodiment of the present invention, the amount is from 35 to 40 mass %; in another embodiment of the present invention, the amount is from 40 to 50 mass %; in another embodiment of the present invention, the amount is from 46 to 50 mass %; and in another embodiment of the present invention, the amount is from 49 to 50 mass %.

In the case where the viscosity of the liquid crystal composition of the present invention needs to be kept at a low level for allowing the liquid crystal composition to contribute to a high response speed, it is preferred that the lower limit of the above-mentioned range be high and that the upper limit thereof be high. In the case where the Tni of the liquid crystal composition of the present invention needs to be kept at a high level to allow the liquid crystal composition to have a high temperature stability, it is preferred that the lower limit of the above-mentioned range be moderate and that the upper limit thereof be moderate. In order to increase dielectric anisotropy for keeping driving voltage at a low level, it is preferred that the lower limit of the above-mentioned range be low and that the upper limit thereof be low.

Alternatively or additionally, the compound represented by General Formula (I-1) is preferably at least one compound selected from the group consisting of compounds represented by General Formula (I-1-1).

In General Formula (I-1-1), R¹² represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 5 carbon atoms; and the compound represented by General Formula (I-1-1) excludes the compound represented by Formula (ii).

In the liquid crystal composition of the present invention, the amount of the compound represented by General Formula (I-1-1) needs to be appropriately adjusted on the basis of intended properties such as resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, process adaptability, resistance to droplet stains and screen burn-in, and dielectric anisotropy.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (I-1-1) is in the range of 1 to 30 mass % in an embodiment of the present invention; in another embodiment of the present invention, the amount is from 1 to 25 mass %; in another embodiment of the present invention, the amount is from 1 to 20 mass %; in another embodiment of the present invention, the amount is from 1 to 16 mass %; in another embodiment of the present invention, the amount is from 1 to 16 mass %; in another embodiment of the present invention, the amount is from 4 to 16 mass %; in another embodiment of the present invention, the amount is from 9 to 10 mass %; and in another embodiment of the present invention, the amount is from 12 to 16 mass %.

The compound represented by General Formula (I-1-1) is preferably a compound selected from a compound represented by Formula (1.1) and/or a compound represented by Formula (1.2), and more preferably the compound represented by Formula (1.2).

Alternatively or additionally, the compound represented by General Formula (I-1) is preferably at least one compound selected from the group consisting of compounds represented by General Formula (I-1-2).

In General Formula (I-1-2), R¹² represents an alkyl group having 1 to 5 carbon groups, an alkoxy groups having 1 to 5 carbon groups, or an alkenyl groups having 2 to 5 carbon atoms.

Such compounds can be used in any combination; a combination of the compounds are properly determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two of the compounds are used. In another embodiment of the present invention, three of the compounds are used.

In the liquid crystal composition of the present invention, the amount of the compound represented by General Formula (I-1-2) needs to be appropriately adjusted on the basis of intended properties such as resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, process adaptability, resistance to droplet stains and screen burn-in, and dielectric anisotropy.

The amount of the compound represented by General Formula (I-1-2) is preferably in the range of 5 to 65 mass %, more preferably 10 to 60 mass %, and further preferably 15 to 55 mass % relative to the total mass of the liquid crystal composition of the present invention. In particular, for example, the amount is preferably in the range of 7 to 50 mass %, also preferably 15 to 50 mass %, also preferably 15 to 30 mass %, also preferably 25 to 45 mass %, also preferably 25 to 40 mass %, also preferably 30 to 40 mass %, also preferably 32 to 45 mass %, also preferably 32 to 40 mass %, also preferably 35 to 40 mass %, and also preferably 40 to 50 mass %.

In the case where the liquid crystal composition contains three compounds represented by General Formula (i), the total amount of the compounds represented by General Formula (I-1-2) is preferably in the range of 25 to 45 mass %, more preferably 28 to 45 mass %, and further preferably 30 to 43 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition contains two compounds represented by General Formula (i), the total amount of the compounds represented by General Formula (I-1-2) is preferably in the range of 25 to 45 mass %, more preferably 32 to 45 mass %, and further preferably 32 to 40 mass % relative to the total mass of the liquid crystal composition.

The compound represented by General Formula (I-1-2) is preferably a compound selected from the group consisting of compounds represented by Formulae (2.1) to (2.4), and more preferably the compounds represented by Formulae (2.2) to (2.4). In particular, the compound represented by Formula (2.2) particularly enhances the response speed of the liquid crystal composition of the present invention and is therefore preferably employed. In the case where high Tni is valued rather than the response speed, it is preferred that the compound represented by Formula (2.3) or (2.4) be employed. In order to improve resistance to resolution at low temperature, it is preferred that the amount of each of the compounds represented by Formulae (2.3) and (2.4) be less than 30 mass % relative to the total mass of the liquid crystal composition.

In the liquid crystal composition of the present invention, the amount of the compound represented by Formula (2.2) is preferably in the range of 3 mass % to 65 mass %, also preferably 6 mass % to 60 mass %, and also preferably 9 mass % to 55 mass % relative to the total mass of the liquid crystal composition of the present invention. In particular, the amount is preferably in the range of 9 mass % to 50 mass %, also preferably 15 mass % to 50 mass %, also preferably 20 mass % to 50 mass %, also preferably 25 mass % to 50 mass %, also preferably 28 mass % to 50 mass %, also preferably 31 mass % to 50 mass %, also preferably 35 mass % to 50 mass %, also preferably 40 mass % to 50 mass %, also preferably 46 mass % to 50 mass %, and also preferably 49 mass % to 50 mass %.

In the liquid crystal composition of the present invention, the amount of the compound represented by Formula (2.3) is preferably less than 18 mass %, also preferably 1 mass % or more and less than 18 mass %, also preferably 5 mass % or more and 17 mass % or less, also preferably 7 mass % or more and 16 mass % or less, and also preferably 10 mass % or more and 17 mass % or less relative to the total mass of the liquid crystal composition of the present invention.

In the liquid crystal composition of the present invention, the amount of the compound represented by Formula (2.4) is preferably less than 20 mass %, also preferably 1 mass % or more and less than 20 mass %, also preferably 1 mass % or more and 18 mass % or less, also preferably 5 mass % or more and 15 mass % or less, and also preferably 10 mass % or more and 12 mass % or less relative to the total mass of the liquid crystal composition of the present invention.

In the case where the liquid crystal composition contains three compounds represented by General Formula (i), the amount of the compound represented by Formula (2.2) is preferably in the range of 25 to 45 mass %, more preferably 30 to 45 mass %, and further preferably 30 to 40 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition contains two compounds represented by General Formula (i), the amount of the compound represented by Formula (2.2) is preferably in the range of 25 to 45 mass %, more preferably 31 to 45 mass %, and further preferably 31 to 40 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition contains three compounds represented by General Formula (i), the total amount of the compound represented by Formula (2.3) and the compound represented by Formula (2.4) is preferably in the range of 18 to 40 mass %, more preferably 20 to 35 mass %, and further preferably 23 to 30 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition contains two compounds represented by General Formula (i), the total amount of the compound represented by Formula (2.3) and the compound represented by Formula (2.4) is preferably in the range of 10 to 21 mass %, more preferably 13 to 21 mass %, and further preferably 16 to 21 mass % relative to the total mass of the liquid crystal composition.

The liquid crystal composition of the present invention can further contain a compound represented by Formula (2.5), the compound having a structure similar to that of the compound represented by General Formula (I-1-2).

The amount of the compound represented by Formula (2.5) is preferably adjusted on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence; the amount is preferably in the range of 1 to 40 mass %, also preferably 1 to 35 mass %, also preferably 1 to 30 mass %, also preferably 5 to 30 mass %, also preferably 10 to 30 mass %, also preferably 15 to 30 mass %, also preferably 20 to 30 mass %, and also preferably 25 to 30 mass % relative to the total mass of the liquid crystal composition of the present invention.

Alternatively or additionally, the compound represented by General Formula (I) is preferably at least one compound selected from the group consisting of compounds represented by General Formula (I-2).

In General Formula (I-2), R¹³ and R¹⁴ each independently represent an alkyl group having 1 to 5 carbon atoms.

Such compounds can be used in any combination; a combination of the compounds is determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two of the compounds are used. In another embodiment of the present invention, three of the compounds are used.

In the liquid crystal composition of the present invention, the amount of the compound represented by General Formula (I-2) needs to be appropriately adjusted on the basis of intended properties such as resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, process adaptability, resistance to droplet stains and screen burn-in, and dielectric anisotropy.

Relative to the total mass of the liquid crystal composition of the present invention, for instance, the amount of the compound represented by General Formula (I-2) is in the range of 1 to 30 mass % in an embodiment of the present invention; in another embodiment of the present invention, the amount is from 1 to 25 mass %; in another embodiment of the present invention, the amount is from 1 to 23 mass %; and in another embodiment of the present invention, the amount is from 4 to 23 mass %.

The compound represented by General Formula (I-2) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (3.1) to (3.4); more preferably the compound represented by Formula (3.1), the compound represented by Formula (3.3), and/or the compound represented by Formula (3.4); and further preferably the compound represented by Formula (3.3). In particular, the compound represented by Formula (3.1) particularly enhances the response speed of the liquid crystal composition of the present invention and is therefore preferably employed. In the case where high Tni is valued rather than the response speed, it is preferred that the compound represented by Formula (3.3) and/or the compound represented by Formula (3.4) be employed. In order to improve resistance to resolution at low temperature, it is preferred that the amount of each of the compounds represented by Formulae (3.3) and (3.4) be less than 20 mass %.

In the liquid crystal composition of the present invention, the amount of the compound represented by Formula (3.3) is preferably 0.5 mass % or more and less than 5 mass %, and more preferably 2 mass % or more and 4.5 mass % or less relative to the total mass of the liquid crystal composition of the present invention.

Alternatively or additionally, the compound represented by General Formula (I) is preferably at least one compound selected from the group consisting of compounds represented by General Formula (I-3).

In General Formula (I-3), R¹³ represents an alkyl group having 1 to 5 carbon atoms, and R¹⁵ represents an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; a combination of the compounds is determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two of the compounds are used. In another embodiment of the present invention, three of the compounds are used.

In the liquid crystal composition of the present invention, the amount of the compound represented by General Formula (I-3) needs to be appropriately adjusted on the basis of intended properties such as resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, process adaptability, resistance to droplet stains and screen burn-in, and dielectric anisotropy.

Relative to the total mass of the liquid crystal composition of the present invention, for instance, the amount of the compound represented by General Formula (I-3) is in the range of 3 to 30 mass % in an embodiment of the present invention; in another embodiment of the present invention, the amount is from 4 to 30 mass %; in another embodiment of the present invention, the amount is from 15 to 30 mass %; in another embodiment of the present invention, the amount is from 25 to 30 mass %; in another embodiment of the present invention, the amount is from 3 to 25 mass %; in another embodiment of the present invention, the amount is from 3 to 20 mass %; in another embodiment of the present invention, the amount is from 3 to 15 mass %; and in another embodiment of the present invention, the amount is from 3 to 5 mass %.

In terms of resistance to resolution at low temperature, the amount is adjusted to be larger to produce a greater effect; in terms of response speed, the amount is adjusted to be smaller to produce a greater effect. In order to enhance resistance to droplet stains and screen burn-in, the range of the amount is preferably adjusted to be intermediate.

The compound represented by General Formula (I-3) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (4.1) to (4.3), and more preferably the compound represented by Formula (4.3).

The amount of the compound represented by Formula (4.3) is preferably in the range of 2 mass % to 30 mass %, also preferably 4 mass % to 30 mass %, also preferably 6 mass % to 30 mass %, also preferably 8 mass % to 30 mass %, also preferably 10 mass % to 30 mass %, also preferably 12 mass % to 30 mass %, also preferably 14 mass % to 30 mass %, also preferably 16 mass % to 30 mass %, also preferably 18 mass % to 25 mass %, also preferably 20 mass % to 24 mass %, and especially preferably 22 mass % to 23 mass % relative to the total mass of the liquid crystal composition of the present invention.

Alternatively or additionally, the compound represented by General Formula (I) is preferably at least one compound selected from the group consisting of compounds represented by General Formula (I-4).

In General Formula (I-4), R¹¹ and R¹² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 or 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; a combination of the compounds is determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two of the compounds are used.

In the liquid crystal composition of the present invention, the amount of the compound represented by General Formula (I-4) needs to be appropriately adjusted on the basis of intended properties such as resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, process adaptability, resistance to droplet stains and screen burn-in, and dielectric anisotropy.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (I-4) is in the range of 5 to 30 mass % in an embodiment of the present invention; in another embodiment of the present invention, the amount is from 5 to 25 mass %; in another embodiment of the present invention, the amount is from 5 to 20 mass %; and in another embodiment of the present invention, the amount is from 5 to 15 mass %.

In terms of an enhancement in birefringence, the amount is adjusted to be larger to produce a greater effect; in terms of high Tni, the amount is adjusted to be smaller to produce a greater effect. In order to enhance resistance to droplet stains and screen burn-in, the range of the amount is preferably adjusted to be intermediate.

The compound represented by General Formula (I-4) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (5.1) to (5.4), more preferably at least one compound selected from the group consisting of the compounds represented by Formulae (5.2) to (5.4), and further preferably the compound represented by Formula (5.2) and/or the compound represented by Formula (5.3).

The amount of the compound represented by Formula (5.2) is preferably in the range of 1 to 30 mass %, more preferably 5 to 25 mass %, and further preferably 7 to 20 mass % relative to the total mass of the liquid crystal composition of the present invention.

In an embodiment of the present invention, for instance, the amount of the compound represented by Formula (5.3) is preferably in the range of 5 to 30 mass %, more preferably 5 to 25 mass %, and further preferably 5 to 20 mass % relative to the total mass of the liquid crystal composition of the present invention.

Alternatively or additionally, the compound represented by General Formula (I) is preferably at least one compound selected from the group consisting of compounds represented by General Formula (I-5).

In General Formula (I-5), R¹¹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; and R¹² represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 or 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; a combination of the compounds is determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two of the compounds are used.

In the liquid crystal composition of the present invention, the amount of the compound represented by General Formula (I-5) needs to be appropriately adjusted on the basis of intended properties such as resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, process adaptability, resistance to droplet stains and screen burn-in, and dielectric anisotropy.

Relative to the total mass of the liquid crystal composition of the present invention, for instance, the amount of the compound represented by General Formula (I-5) is in the range of 1 to 25 mass % in an embodiment of the present invention; in another embodiment of the present invention, the amount is from 1 to 20 mass %; in another embodiment of the present invention, the amount is from 1 to 15 mass %; in another embodiment of the present invention, the amount is from 3 to 15 mass %; in another embodiment of the present invention, the amount is from 5 to 15 mass %; in another embodiment of the present invention, the amount is from 5 to 11 mass %; and in another embodiment of the present invention, the amount is from 10 to 11 mass %.

In terms of resistance to resolution at low temperature, the amount is adjusted to be larger to produce a greater effect; in terms of response speed, the amount is adjusted to be smaller to produce a greater effect. In order to enhance resistance to droplet stains and screen burn-in, the range of the amount is preferably adjusted to be intermediate.

The compound represented by General Formula (I-5) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (6.1) to (6.6); more preferably the compound represented by Formula (6.3), the compound represented by Formula (6.4), and/or the compound represented by Formula (6.6); and further preferably the compound represented by Formula (6.3) and/or the compound represented by Formula (6.6).

The amount of the compound represented by Formula (6.3) is, for example, preferably not less than 8 mass %, more preferably from 8 mass % to 25 mass %, further preferably from 8 mass % to 20 mass %, and especially preferably from 10 mass % to 15 mass % relative to the total mass of the liquid crystal composition of the present invention.

The amount of the compound represented by Formula (6.6) is, for instance, preferably in the range of 1 mass % to 25 mass %, more preferably 1 mass % to 20 mass %, further preferably 1 mass % to 15 mass %, and especially preferably 1 mass % to 10 mass % relative to the total mass of the liquid crystal composition of the present invention.

The compound represented by General Formula (I-5), which can be contained in the liquid crystal composition of the present invention, can be also a compound represented by Formula (6.7) and/or a compound represented by Formula (6.8).

The amount of the compound represented by Formula (6.7) is preferably adjusted on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence; the amount is preferably in the range of 2 mass % to 30 mass %, also preferably 3 mass % to 27 mass %, also preferably 5 mass % to 25 mass %, and also preferably 7 mass % to 23 mass % relative to the total mass of the liquid crystal composition of the present invention.

Alternatively or additionally, the compound represented by General Formula (I) is preferably at least one compound selected from the group consisting of compounds represented by General Formula (I-6).

In Formula (I-6), R¹¹ and R¹² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 or 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; X¹¹ and X¹² each independently represent a fluorine atom or a hydrogen atom; and any one of X¹¹ and X¹² is a fluorine atom.

The amount of the compound represented by General Formula (I-6) is preferably in the range of 2 mass % to 30 mass %, also preferably 4 mass % to 30 mass %, also preferably 5 mass % to 30 mass %, also preferably 6 mass % to 30 mass %, also preferably 9 mass % to 30 mass %, also preferably 12 mass % to 30 mass %, also preferably 14 mass % to 30 mass %, also preferably 16 mass % to 30 mass %, also preferably 18 mass % to 25 mass %, also preferably 20 mass % to 24 mass %, and also preferably 22 mass % to 23 mass % relative to the total mass of the liquid crystal composition of the present invention.

The compound represented by General Formula (I-6) is preferably a compound represented by Formula (7.1).

Alternatively or additionally, the compound represented by General Formula (I) is preferably a compound selected from the group consisting of compounds represented by General Formula (I-7).

In General Formula (I-7), R¹¹ and R¹² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; and X¹² represents a fluorine atom or a chlorine atom.

The amount of the compound represented by General Formula (I-7) is preferably in the range of 0.5 mass % to 20 mass %, more preferably 0.5 mass % to 15 mass %, further preferably 0.5 mass % to 10 mass %, and especially preferably 0.5 mass % to 5 mass % relative to the total mass of the liquid crystal composition of the present invention.

The compound represented by General Formula (I-7) is preferably a compound represented by Formula (8.1).

Alternatively or additionally, the compound represented by General Formula (I) is preferably at least one compound selected from the group consisting of compounds represented by General Formula (I-8).

In General Formula (I-8), R¹⁶ and R¹⁷ each independently represent an alkenyl group having 2 to 5 carbon atoms.

Such compounds can be used in any combination; in view of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence, it is preferred that that up to three of the compounds be used in combination.

The amount of the compound represented by General Formula (I-8) is adjusted on the basis of intended properties such as resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, process adaptability, resistance to droplet stains and screen burn-in, and dielectric anisotropy; the amount is preferably in the range of 1 to 25 mass %, also preferably 1 to 20 mass %, also preferably 1 to 15 mass %, also preferably 1 to 10 mass %, also preferably 3 to 10 mass %, also preferably 5 to 10 mass %, and also preferably 6 to 9 mass % relative to the total mass of the liquid crystal composition of the present invention.

The compound represented by General Formula (I-8) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (9.1) to (9.10); more preferably the compound represented by Formula (9.2), the compound represented by Formula (9.4), and/or the compound represented by Formula (9.7); and further preferably the compound represented by Formula (9.2).

Alternatively or additionally, the compound represented by General Formula (L) is, for example, preferably at least one compound selected from compounds represented by General Formula (II).

In General Formula (II), R²¹ and R²² each independently represent an alkenyl group having 2 to 5 carbon atoms, an alkyl group having 1 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; A² represents a 1,4-cyclohexylene group or a 1,4-phenylene group; and Q² represents a single bond, —COO—, —CH₂—CH₂—, or CF₂O—.

Such compounds can be used in any combination; a combination of the compounds is determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two of the compounds are used. In another embodiment of the present invention, three of the compounds are used. In another embodiment of the present invention, four or more of the compounds are used.

In the liquid crystal composition of the present invention, the amount of the compound represented by General Formula (II) needs to be appropriately adjusted on the basis of intended properties such as resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, process adaptability, resistance to droplet stains and screen burn-in, and dielectric anisotropy.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (II) is in the range of 1 to 45 mass % in an embodiment of the present invention; in another embodiment of the present invention, the amount is from 1 to 40 mass %; in another embodiment of the present invention, the amount is from 1 to 35 mass %; in another embodiment of the present invention, the amount is from 1 to 30 mass %; in another embodiment of the present invention, the amount is from 3 to 30 mass %; in another embodiment of the present invention, the amount is from 5 to 30 mass %; in another embodiment of the present invention, the amount is from 10 to 30 mass %; in another embodiment of the present invention, the amount is from 15 to 30 mass %; in another embodiment of the present invention, the amount is from 20 to 30 mass %; in another embodiment of the present invention, the amount is from 25 to 30 mass %; in another embodiment of the present invention, the amount is from 1 to 25 mass %; in another embodiment of the present invention, the amount is from 1 to 20 mass %; in another embodiment of the present invention, the amount is from 1 to 15 mass %; in another embodiment of the present invention, the amount is from 1 to 10 mass %; in another embodiment of the present invention, the amount is from 5 to 10 mass %; in another embodiment of the present invention, the amount is from 9 to 10 mass %; in another embodiment of the present invention, the amount is from 9 to 16 mass %; in another embodiment of the present invention, the amount is from 15 to 25 mass %; in another embodiment of the present invention, the amount is from 20 to 30 mass %; and in another embodiment of the present invention, the amount is from 23 to 27 mass %.

The compound represented by General Formula (II) is, for instance, preferably at least one compound selected from the group consisting of compounds represented by General Formula (II-1).

In General Formula (II-1), R²¹ and R²² each independently represent an alkenyl group having 2 to 5 carbon atoms, an alkyl group having 1 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The amount of the compound represented by General Formula (II-1) is preferably adjusted on the basis of intended properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence; the amount is preferably in the range of 1 mass % to 25 mass %, also preferably 5 mass % to 20 mass %, and also preferably 8 mass % to 15 mass %.

The compound represented by General Formula (II-1) is, for example, preferably a compound represented by Formula (10.1) and/or a compound represented by Formula (10.2), and more preferably the compound represented by Formula (10.1).

The amount of the compound represented by Formula (10.1) is preferably in the range of 1 to 25 mass %, more preferably 3 to 20 mass %, and further preferably 5 to 15 mass % relative to the total mass of the liquid crystal composition of the present invention.

Alternatively or additionally, the compound represented by General Formula (II) is, for instance, preferably at least one compound selected from the group consisting of compounds represented by General Formula (II-2).

In General Formula (II-2), R²³ represents an alkenyl group having 2 to 5 carbon atoms, and R²⁴ represents an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; a combination of the compounds is determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two or more of the compounds are used.

In the liquid crystal composition of the present invention, the amount of the compound represented by General Formula (II-2) needs to be appropriately adjusted on the basis of intended properties such as resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, process adaptability, resistance to droplet stains and screen burn-in, and dielectric anisotropy.

Relative to the total mass of the liquid crystal composition of the present invention, for instance, the amount of the compound represented by General Formula (II-2) is in the range of 1 to 45 mass % in an embodiment of the present invention; in another embodiment of the present invention, the amount is from 4 to 40 mass %; in another embodiment of the present invention, the amount is from 6 to 40 mass %; in another embodiment of the present invention, the amount is from 21 to 40 mass %; in another embodiment of the present invention, the amount is from 6 to 27 mass %; in another embodiment of the present invention, the amount is from 6 to 20 mass %; in another embodiment of the present invention, the amount is from 10 to 20 mass %; and in another embodiment of the present invention, the amount is from 21 to 35 mass %.

The compound represented by General Formula (II-2) is, for example, preferably at least one compound selected from the group consisting of compounds represented by Formulae (11.1) to (11.3).

On the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence, the compound represented by Formula (11.1) may be used, the compound represented by Formula (11.2) may be used, the compounds represented by Formulae (11.1) and (11.2) may be used in combination, and all of the compounds represented by Formulae (11.1) to (11.3) may be used in combination; however, it is preferred that at least any one of the compounds represented by Formulae (11.1) and (11.2) be used.

The amount of the compound represented by Formula (11.1) is preferably in the range of 1 to 30 mass %, also preferably 1 to 25 mass %, and also preferably 1 to 20 mass % relative to the total mass of the liquid crystal composition of the present invention.

In the case where the liquid crystal composition of the present invention contains three compounds represented by General Formula (i), the amount of the compound represented by Formula (11.1) is preferably in the range of 6 to 30 mass %, more preferably 6 to 25 mass %, and further preferably 6 to 20 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains two compounds represented by General Formula (i), the amount of the compound represented by Formula (11.1) is preferably in the range of 6 to 30 mass %, more preferably 6 to 25 mass %, and further preferably 6 to 20 mass % relative to the total mass of the liquid crystal composition.

The amount of the compound represented by Formula (11.2) is preferably in the range of 1 to 30 mass %, also preferably 4 to 30 mass %, also preferably 9 to 30 mass %, also preferably 13 to 30 mass %, also preferably 13 to 25 mass %, and also preferably 13 to 20 mass % relative to the total mass of the liquid crystal composition of the present invention. In particular, the lower limit of the amount of the compound represented by Formula (11.2) is preferably 13 mass %, also preferably 14 mass %, and also preferably 15 mass % relative to the total mass of the liquid crystal composition of the present invention.

In the case where the compounds represented by Formulae (11.1) and (11.2) are used in combination, the total mass of these compounds is preferably in the range of 1 mass % to 45 mass %, also preferably 15 mass % to 45 mass %, also preferably 21 mass % to 45 mass %, also preferably 21 mass % to 40 mass %, and also preferably 21 mass % to 35 mass % relative to the total mass of the liquid crystal composition of the present invention.

In the case where the liquid crystal composition of the present invention contains three compounds represented by General Formula (i) and where the compounds represented by Formulae (11.1) and (11.2) are used in combination, the total amount of the compounds represented by Formulae (11.1) and (11.2) is preferably in the range of 15 mass % to 40 mass %, more preferably 20 mass % to 35 mass %, and further preferably 23 mass % to 30 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains two compounds represented by General Formula (i) and where the compounds represented by Formulae (11.1) and (11.2) are used in combination, the total amount of the compounds represented by Formulae (11.1) and (11.2) is preferably in the range of 5 mass % to 30 mass %, more preferably 10 mass % to 25 mass %, and further preferably 13 mass % to 20 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i) and where the compounds represented by Formulae (11.1) and (11.2) are used in combination, the total amount of the compounds represented by Formulae (11.1) and (11.2) is preferably in the range of 21 mass % to 40 mass %, more preferably 22 mass % to 35 mass %, and further preferably 23 mass % to 31 mass % relative to the total mass of the liquid crystal composition.

Alternatively or additionally, the compound represented by General Formula (II) is, for example, preferably at least one compound selected from the group consisting of compounds represented by General Formula (II-3).

In General Formula (II-3), R²⁵ represents an alkyl group having 1 to 5 carbon atoms, and R²⁴ represents an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence, it is preferred that up to three of the compounds be used.

The amount of the compound represented by General Formula (II-3) needs to be appropriately adjusted on the basis of intended properties such as resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, process adaptability, resistance to droplet stains and screen burn-in, and dielectric anisotropy.

The preferred amount of the compound represented by General Formula (II-3) is, for instance, in the range of 2 to 45 mass % relative to the total mass of the liquid crystal composition of the present invention. In particular, the amount is, for example, preferably from 5 to 45 mass %, also preferably 8 to 45 mass %, also preferably 11 to 45 mass %, also preferably 14 to 45 mass %, also preferably 17 to 45 mass %, also preferably 20 to 45 mass %, also preferably 23 to 45 mass %, also preferably 26 to 45 mass %, also preferably 29 to 45 mass %, also preferably 2 to 45 mass %, also preferably 2 to 40 mass %, also preferably 2 to 35 mass %, also preferably 2 to 30 mass %, also preferably 2 to 25 mass %, also preferably 2 to 20 mass %, also preferably 2 to 15 mass %, and also preferably 2 to 10 mass %.

The compound represented by General Formula (II-3) is, for instance, preferably at least one compound selected from the group consisting of compounds represented by Formulae (12.1) to (12.3).

On the basis of intended properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence, the compound represented by Formula (12.1) may be used, the compound represented by Formula (12.2) may be used, and the compounds represented by Formulae (12.1) and (12.2) may be used in combination.

The amount of the compound represented by Formula (12.1) is preferably in the range of 3 mass % to 40 mass %, also preferably 5 mass % to 40 mass %, also preferably 7 mass % to 40 mass %, also preferably 9 mass % to 40 mass %, also preferably 11 mass % to 40 mass %, also preferably 12 mass % to 40 mass %, also preferably 13 mass % to 40 mass %, also preferably 18 mass % to 30 mass %, and also preferably 21 mass % to 25 mass % relative to the total mass of the liquid crystal composition of the present invention.

The amount of the compound represented by Formula (12.2) is preferably in the range of 3 mass % to 40 mass %, also preferably 5 mass % to 40 mass %, also preferably 8 mass % to 40 mass %, also preferably 10 mass % to 40 mass %, also preferably 12 mass % to 40 mass %, also preferably 15 mass % to 40 mass %, also preferably 17 mass % to 30 mass %, and also preferably 19 mass % to 25 mass % relative to the total mass of the liquid crystal composition of the present invention.

In the case where the compounds represented by Formulae (12.1) and (12.2) are used in combination, the total mass of these compounds is preferably in the range of 15 mass % to 45 mass %, also preferably 19 mass % to 45 mass %, also preferably 24 mass % to 40 mass %, and also preferably 30 mass % to 35 mass % relative to the total mass of the liquid crystal composition of the present invention.

The amount of the compound represented by Formula (12.3) is preferably in the range of 0.05 mass % to 2 mass %, also preferably 0.1 mass % to 1 mass %, and also preferably 0.2 mass % to 0.5 mass % relative to the total mass of the liquid crystal composition of the present invention. The compound represented by Formula (12.3) may be an optically active compound.

The compound represented by General Formula (II-3) is, for example, preferably at least one compound selected from the group consisting of compounds represented by General Formula (II-3-1).

In General Formula (II-3-1), R²⁵ represents an alkyl group having 1 to 5 carbon atoms, and R²⁶ represents an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence, it is preferred that up to three of the compounds be used.

The amount of the compound represented by General Formula (II-3-1) is preferably adjusted on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence; the amount is preferably in the range of 1 mass % to 24 mass %, also preferably 4 mass % to 18 mass %, and also preferably 6 mass % to 14 mass %.

The compound represented by General Formula (II-3-1) is, for instance, preferably at least one compound selected from the group consisting of compounds represented by Formulae (13.1) to (13.4), and especially preferably the compound represented by Formula (13.3).

Alternatively or additionally, the compound represented by General Formula (II) is, for example, preferably at least one compound selected from the group consisting of compounds represented by General Formula (II-4).

In General Formula (II-4), R²¹ and R²² each independently represent an alkenyl group having 2 to 5 carbon atoms, an alkyl group having 1 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds may be used alone or in combination, and it is preferred that a proper combination thereof be determined on the basis of desired properties. The compounds can be used in any combination; in view of intended properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence, one or two of the compounds are preferably used, and one to three of the compounds are more preferably used.

The amount of the compound represented by General Formula (II-4) is preferably in the range of 1 mass % to 15 mass %, also preferably 2 mass % to 15 mass %, also preferably 3 mass % to 15 mass %, also preferably 4 mass % to 12 mass %, and also preferably 5 mass % to 7 mass % relative to the total mass of the liquid crystal composition of the present invention.

The compound represented by General Formula (II-4) is, for instance, preferably at least one compound selected from the group consisting of compounds represented by Formulae (14.1) to (14.5), and especially preferably the compound represented by Formula (14.2) and/or the compound represented by Formula (14.5).

Alternatively or additionally, the compound represented by General Formula (L) is preferably at least one compound selected from the group consisting of compounds represented by General Formula (III).

In General Formula (III), R³¹ and R³² each independently represent an alkenyl group having 2 to 5 carbon atoms, an alkyl group having 1 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

In view of desired properties such as birefringence and resistance to resolution, the amount of the compound represented by General Formula (III) is preferably in the range of 1 mass % to 25 mass %, also preferably 6 mass % to 25 mass %, also preferably 6 mass % to 20 mass %, also preferably 6 mass % to 15 mass %, and also preferably 7 mass % to 10 mass % relative to the total mass of the liquid crystal composition of the present invention. In particular, the lower limit of the amount of the compound represented by General Formula (III) is preferably 6 mass %, and more preferably 7 mass % relative to the total mass of the liquid crystal composition of the present invention.

The compound represented by General Formula (III) is, for instance, preferably a compound represented by Formula (15.1) and/or a compound represented by Formula (15.2), and especially preferably the compound represented by Formula (15.1).

In view of desired properties such as birefringence and resistance to resolution, the amount of the compound represented by Formula (15.1) is preferably in the range of 6 mass % to 25 mass %, also preferably 6 mass % to 20 mass %, also preferably 6 mass % to 15 mass %, and also preferably 6 mass % to 10 mass % relative to the total mass of the liquid crystal composition of the present invention.

The compound represented by General Formula (III) is preferably at least one compound selected from the group consisting of compounds represented by General Formula (III-1).

In General Formula (III-1), R³³ represents an alkenyl group having 2 to 5 carbon atoms, and R³² represents an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms.

The amount of the compound represented by General Formula (III-1) is preferably adjusted on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence; the amount is preferably in the range of 4 mass % to 23 mass %, also preferably 6 mass % to 18 mass %, and also preferably 10 mass % to 13 mass % relative to the total mass of the liquid crystal composition of the present invention.

The compound represented by General Formula (III-1) is, for example, preferably a compound represented by Formula (16.1) and/or a compound represented by Formula (16.2).

Alternatively or additionally, the compound represented by General Formula (III) is preferably at least one compound selected from the group consisting of compounds represented by General Formula (III-2).

In General Formula (III-2), R³¹ represents an alkyl group having 1 to 5 carbon atoms, and R³⁴ represents an alkoxy group having 1 to 4 carbon atoms.

The amount of the compound represented by General Formula (III-2) is preferably adjusted on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence; the amount is preferably in the range of 4 mass % to 23 mass %, also preferably 6 mass % to 18 mass %, and also preferably 10 mass % to 13 mass % relative to the total mass of the liquid crystal composition of the present invention.

The compound represented by General Formula (III-2) is, for instance, preferably at least one compound selected from the group consisting of compounds represented by Formulae (17.1) to (17.3), and especially preferably the compound represented by Formula (17.3).

Alternatively or additionally, the compound represented by General Formula (L) is preferably at least one compound selected from the group consisting of compounds represented by General Formula (IV).

In General Formula (IV), R⁴¹ and R⁴² each independently represent an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and X⁴¹ and X⁴² each independently represent a hydrogen atom or a fluorine atom.

Such compounds can be used in any combination; a combination of the compounds is properly determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two of the compounds are used. In another embodiment of the present invention, three of the compounds are used. In another embodiment of the present invention, four of the compounds are used. In another embodiment of the present invention, five of the compounds are used. In another embodiment of the present invention, six or more of the compounds are used.

The compound represented by General Formula (IV) is, for instance, preferably at least one compound selected from the group consisting of compounds represented by General Formula (IV-1).

In General Formula (IV-1), R⁴³ and R⁴⁴ each independently represent an alkyl group having 1 to 5 carbon atoms.

The amount of the compound represented by General Formula (IV-1) needs to be appropriately adjusted on the basis of intended properties such as resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, process adaptability, resistance to droplet stains and screen burn-in, and dielectric anisotropy.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (IV-1) is in the range of 1 to 35 mass % in an embodiment of the present invention; in another embodiment of the present invention, the amount is from 3 to 35 mass %; in another embodiment of the present invention, the amount is from 3 to 30 mass %; and in another embodiment of the present invention, the amount is from 3 to 25 mass %.

The compound represented by General Formula (IV-1) is, for instance, preferably at least one compound selected from the group consisting of compounds represented by Formulae (18.1) to (18.9).

Such compounds can be used in any combination; one to three of the compounds are preferably used, and one to four of the compounds are more preferably used. Use of a compound having a broad molecular weight distribution is also effective for resistance to resolution; hence, a preferred example of use of these compounds is as follows: one compound is selected from the compounds represented by Formulae (18.1) and (18.2), one compound is selected from the compounds represented by Formulae (18.4) and (18.5), one compound is selected from the compounds represented by Formulae (18.6) and (18.7), one compound is selected from the compounds represented by Formulae (18.8) and (18.9), and a proper combination of the selected compounds is determined. In particular, it is preferred that the compound represented by Formula (18.1), the compound represented by Formula (18.3), the compound represented by Formula (18.4), and/or the compound represented by Formula (18.6) be used; and it is more preferred that the compound represented by Formula (18.3), the compound represented by Formula (18.4), and/or the compound represented by Formula (18.6) be used.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by Formula (18.3) is in the range of 1 to 26 mass % in an embodiment of the present invention; in another embodiment of the present invention, the amount is from 2 to 21 mass %; in another embodiment of the present invention, the amount is from 3 to 16 mass %; and in another embodiment of the present invention, the amount is from 4 to 11 mass %.

The amount of the compound represented by Formula (18.4) or (18.5) is preferably 7 mass %, more preferably from 7 to 25 mass %, further preferably from 9 to 20 mass %, and especially preferably from 9 to 15 mass % relative to the total mass of the liquid crystal composition of the present invention.

The amount of the compound represented by Formula (18.6) or (18.7) is preferably 9 mass %, more preferably from 9 to 25 mass %, further preferably from 10 to 20 mass %, and especially preferably from 10 to 15 mass % relative to the total mass of the liquid crystal composition of the present invention.

Alternatively or additionally, the compound represented by General Formula (IV) is, for example, preferably at least one compound selected from the group consisting of compounds represented by General Formula (IV-2).

In General Formula (IV-2), R⁴⁵ and R⁴⁶ each independently represent an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and at least one of them represents an alkenyl group having 2 to 5 carbon atoms; and X⁴¹ and X⁴² each independently represent a hydrogen atom or a fluorine atom.

Such compounds can be used in any combination; a combination of the compounds is properly determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence.

The amount of the compound represented by General Formula (IV-2) needs to be appropriately adjusted on the basis of intended properties such as resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, process adaptability, resistance to droplet stains and screen burn-in, and dielectric anisotropy. The amount of the compound represented by General Formula (IV-2) is, for example, preferably in the range of 0.5 to 29 mass %, also preferably 0.5 to 24 mass %, also preferably 0.5 to 19 mass %, also preferably 0.5 to 14 mass %, and also preferably 0.5 to 12 mass % relative to the total mass of the liquid crystal composition of the present invention.

The compound represented by General Formula (IV-2) is, for instance, preferably at least one compound selected from the group consisting of compounds represented by Formulae (19.1) to (19.11); among these, the compound represented by Formula (19.2) is particularly preferred.

Use of a compound having a broad molecular weight distribution as a component of the liquid crystal composition is also effective for resistance to resolution; hence, in terms of an improvement in the resistance of the liquid crystal composition to resolution thereof, a preferred example of use of the compounds is as follows: one compound is selected from the compounds represented by Formulae (19.1) and (19.2), one compound is selected from the compounds represented by Formulae (19.3) and (19.4), one compound is selected from the compounds represented by Formulae (19.9) and (19.10), and a proper combination of these selected compounds is determined.

In the liquid crystal composition of the present invention, the amount of the compound represented by Formula (19.1) or (19.2) is preferably 0.5 mass % or more and less than 5 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

In the liquid crystal composition of the present invention, the amount of the compound represented by Formula (19.3) or (19.4) is preferably 6 mass %, more preferably from 6 mass % to 25 mass %, further preferably from 10 mass % to 25 mass %, and especially preferably from 10 mass % to 20 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

In the liquid crystal composition of the present invention, the amount of the compound represented by Formula (19.9) or (19.10) is preferably 0.5 mass % or more and less than 5 mass %, more preferably from 1 mass % to 4 mass %, and further preferably from 2 mass % to 3 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

The compound represented by General Formula (L) is preferably at least one compound selected from the group consisting of compounds represented by General Formula (V).

In General Formula (V), R⁵¹ and R⁵² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; A⁵¹ and A⁵² each independently represent a 1,4-cyclohexylene group or a 1,4-phenylene group; Q⁵ represents a single bond or —COO—; and X⁵¹ and X⁵² each independently represent a fluorine atom or a hydrogen atom.

Such compounds can be used in any combination; a combination of the compounds is properly determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two of the compounds are used. In another embodiment of the present invention, three of the compounds are used. In another embodiment of the present invention, four of the compounds are used.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (V) is in the range of 6 to 30 mass % in an embodiment of the present invention; in another embodiment of the present invention, the amount is from 6 to 25 mass %; in another embodiment of the present invention, the amount is from 6 to 20 mass %; in another embodiment of the present invention, the amount is from 6 to 15 mass %; and in another embodiment of the present invention, the amount is from 6 to 11 mass %.

The compound represented by General Formula (V) is preferably a compound represented by General Formula (V-1).

In General Formula (V-1), R⁵¹ and R⁵² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; and X⁵¹ and X⁵² each independently represent a fluorine atom or a hydrogen atom.

The compound represented by General Formula (V-1) is preferably a compound represented by General Formula (V-1-1).

In General Formula (V-1-1), R⁵¹ and R⁵² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The amount of the compound represented by General Formula (V-1-1) is preferably in the range of 1 mass % to 15 mass %, more preferably 1 mass % to 10 mass %, further preferably 1 mass % to 5 mass %, and further preferably 1 mass % to 4 mass % relative to the total mass of the liquid crystal composition of the present invention.

The compound represented by General Formula (V-1-1) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (20.1) to (20.4), and more preferably the compound represented by Formula (20.2).

Alternatively or additionally, the compound represented by General Formula (V-1) is preferably a compound represented by General Formula (V-1-2).

In General Formula (V-1-2), R⁵¹ and R⁵² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The amount of the compound represented by General Formula (V-1-2) is preferably in the range of 1 mass % to 15 mass %, also preferably 1 mass % to 10 mass %, also preferably 1 mass % to 7 mass %, and also preferably 1 mass % to 5 mass % relative to the total mass of the liquid crystal composition of the present invention.

The compound represented by General Formula (V-1-2) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (21.1) to (21.3), and more preferably the compound represented by Formula (21.1).

Alternatively or additionally, the compound represented by General Formula (V-1) is preferably a compound represented by General Formula (V-1-3).

In General Formula (V-1-3), R⁵¹ and R⁵² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The amount of the compound represented by General Formula (V-1-3) is preferably in the range of 1 mass % to 15 mass %, also preferably 2 mass % to 15 mass %, also preferably 3 mass % to 10 mass %, and also preferably 4 mass % to 8 mass % relative to the total mass of the liquid crystal composition of the present invention.

The compound represented by General Formula (V-1-3) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (22.1) to (22.3), and more preferably the compound represented by Formula (22.1).

Alternatively or additionally, the compound represented by General Formula (V) is preferably a compound represented by General Formula (V-2).

In General Formula (V-2), R⁵¹ and R⁵² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; and X⁵¹ and X⁵² each independently represent a fluorine atom or a hydrogen atom.

Such compounds can be used in any combination; a combination of the compounds is properly determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two or more of the compounds are used.

Relative to the total mass of the liquid crystal composition of the present invention, for instance, the amount of the compound represented by General Formula (V-2) is in the range of 6 to 30 mass % in an embodiment of the present invention; in another embodiment of the present invention, the amount of the compound is from 6 to 25 mass %; in another embodiment of the present invention, the amount of the compound is from 6 to 20 mass %; in another embodiment of the present invention, the amount is from 6 to 15 mass %; and in another embodiment of the present invention, the amount of the compound is from 6 to 11 mass %.

In an embodiment in which the liquid crystal composition of the present invention needs to have a high Tni, the amount of the compound represented by Formula (V-2) is preferably adjusted to be larger; in an embodiment in which the liquid crystal composition needs to have a low viscosity, the amount thereof is preferably adjusted to be smaller.

The compound represented by General Formula (V-2) is preferably a compound represented by General Formula (V-2-1).

In General Formula (V-2-1), R⁵¹ and R⁵² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The amount of the compound represented by General Formula (V-2-1) is preferably in the range of 6 mass % to 30 mass %, also preferably 6 mass % to 25 mass %, also preferably 6 mass % to 20 mass %, also preferably 6 mass % to 15 mass %, and also preferably 6 mass % to 11 mass % relative to the total mass of the liquid crystal composition of the present invention.

The compound represented by General Formula (V-2-1) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (23.1) to (23.4), and more preferably the compound represented by Formula (23.1) and/or the compound represented by Formula (23.2). In particular, it is preferred that the compound represented by Formula (23.1) and the compound represented by Formula (23.2) be employed as the compound represented by General Formula (V-2-1).

Alternatively or additionally, the compound represented by General Formula (V-2) is preferably a compound represented by General Formula (V-2-2).

In General Formula (V-2-2), R⁵¹ and R⁵² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The amount of the compound represented by General Formula (V-2-2) is preferably in the range of 2 mass % to 16 mass %, also preferably 3 mass % to 13 mass %, and also preferably 4 mass % to 10 mass % relative to the total mass of the liquid crystal composition of the present invention.

The compound represented by General Formula (V-2-2) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (24.1) to (24.4), and more preferably the compound represented by Formula (24.1) and/or the compound represented by Formula (24.2).

Alternatively or additionally, the compound represented by General Formula (V) is preferably a compound represented by General Formula (V-3).

In General Formula (V-3), R⁵¹ and R⁵² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; a combination of the compounds is properly determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two of the compounds are used. In another embodiment of the present invention, three or more of the compounds are used.

The amount of the compound represented by General Formula (V-3) is preferably in the range of 1 mass % to 16 mass %, also preferably 1 mass % to 13 mass %, also preferably 1 mass % to 9 mass %, and also preferably 3 mass % to 9 mass % relative to the total mass of the liquid crystal composition of the present invention.

The compound represented by General Formula (V-3) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (25.1) to (25.3).

Alternatively or additionally, the compound represented by General Formula (V), which is used in the liquid crystal composition of the present invention, is preferably a compound represented by General Formula (V-4).

In General Formula (V-4), R⁵¹ and R⁵² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The amount of the compound represented by General Formula (V-4) is preferably in the range of 1 mass % to 15 mass %, also preferably 2 mass % to 15 mass %, also preferably 3 mass % to 10 mass %, and also preferably 4 mass % to 8 mass % relative to the total mass of the liquid crystal composition of the present invention.

The compound represented by General Formula (V-4) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (25.11) to (25.13), and more preferably the compound represented by Formula (25.13).

Alternatively or additionally, the compound represented by General Formula (L), which is used in the liquid crystal composition of the present invention, is preferably a compound represented by General Formula (V′-5).

In General Formula (V′-5), R⁵¹ and R⁵² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The amount of the compound represented by General Formula (V′-5) is preferably in the range of 1 mass % to 15 mass %, also preferably 2 mass % to 15 mass %, also preferably 2 mass % to 10 mass %, and also preferably 5 mass % to 10 mass % relative to the total mass of the liquid crystal composition of the present invention.

The compound represented by General Formula (V′-5) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (25.21) to (25.24), and more preferably the compound represented by Formula (25.21) and/or the compound represented by Formula (25.23).

The liquid crystal composition of the present invention can further contain at least one compound represented by General Formula (VI).

In General Formula (VI), R⁶¹ and R⁶² each independently represent a linear alkyl group having 1 to 10 carbon atoms, a linear alkoxy group having 1 to 10 carbon atoms, or a linear alkenyl group having 2 to 10 carbon atoms.

Such compounds can be used in any combination; on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence, one to three of such compounds are preferably used, one to four of the compounds are more preferably used, and one to five or more of the compounds are especially preferably used.

The amount of the compound represented by General Formula (VI) is preferably in the range of 0 to 35 mass %, also preferably 0 to 25 mass %, and also preferably 0 to 15 mass % relative to the total mass of the liquid crystal composition of the present invention.

In particular, preferred examples of the compound represented by General Formula (VI) include the following compounds.

The liquid crystal composition of the present invention can further contain at least one compound represented by General Formula (VII).

In General Formula (VII), R⁷¹ and R⁷² each independently represent a linear alkyl group having 1 to 10 carbon atoms, a linear alkoxy group having 1 to 10 carbon atoms, or a linear alkenyl group having 4 to 10 carbon atoms.

Such compounds can be used in any combination; a proper use thereof is determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. One to three of such compounds are preferably used, one to four of the compounds are more preferably used, and one to five or more of the compounds are especially preferably used.

The amount of the compound represented by General Formula (VII) is preferably in the range of 0 to 35 mass %, more preferably 0 to 25 mass %, and further preferably 0 to 15 mass % relative to the total mass of the liquid crystal composition of the present invention.

In particular, preferred examples of the compound represented by General Formula (VII) include the following compounds.

Moreover, it is preferred that the liquid crystal composition of the present invention further contain at least one compound represented by General Formula (M).

In General Formula (M), R^(M1) represents an alkyl group having 1 to 8 carbon atoms, and one —CH₂— moiety or two or more —CH₂— moieties not adjoining each other in the alkyl group are each independently optionally substituted with —CH═CH—, —C≡C—, —O—, —CO—, —COO—, or —OCO—;

PM represents 0, 1, 2, 3, or 4;

C^(M1) and C^(M2) each independently represent a group selected from the group consisting of

(d) a 1,4-cyclohexylene group (of which one —CH₂— moiety or two or more —CH₂— moieties not adjoining each other are optionally substituted with —O— or —S—) and

(e) a 1,4-phenylene group (of which one —CH═ moiety or two or more —CH═ moieties not adjoining each other are optionally substituted with —N═), and

the groups (d) and (e) are each independently optionally substituted with a cyano group, a fluorine atom, or a chlorine atom;

K^(M1) and K^(M2) each independently represent a single bond, —CH₂CH₂—, (CH₂)₄—, —OCH₂—, —CH₂O—, —OCF₂—, —CF₂O—, —COO—, —OCO—, or —C≡C—;

in the case where PM is 2, 3, or 4 and where K^(M1) is multiple, the K^(M1) moieties are the same as or different from each other; in the case where PM is 2, 3, or 4 and where C^(M2) is multiple, the C^(M2) moieties are the same as or different from each other;

X^(M1) and X^(M3) each independently represent a hydrogen atom, a chlorine atom, or a fluorine atom;

X^(M2) represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group; and

the compound represented by General Formula (M) excludes the compound represented by General Formula (i).

Such compounds can be used in any combination; a combination of the compounds is properly determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two of the compounds are used. In another embodiment of the present invention, three of the compounds are used. In another embodiment of the present invention, four of the compounds are used. In another embodiment of the present invention, five of the compounds are used. In another embodiment of the present invention, six of the compounds are used. In another embodiment of the present invention, seven or more of the compounds are used.

In the liquid crystal composition of the present invention, the amount of the compound represented by General Formula (M) needs to be appropriately adjusted on the basis of intended properties such as resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, process adaptability, resistance to droplet stains and screen burn-in, and dielectric anisotropy.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (M) is in the range of 1 to 55 mass % in an embodiment of the present invention; in another embodiment of the present invention, the amount of the compound is from 3 to 50 mass %; in another embodiment of the present invention, the amount of the compound is from 5 to 45 mass %; in another embodiment of the present invention, the amount of the compound is from 8 to 41 mass %; in another embodiment of the present invention, the amount of the compound is from 8 to 20 mass %; in another embodiment of the present invention, the amount of the compound is from 19 to 25 mass %; in another embodiment of the present invention, the amount of the compound is from 25 to 31 mass %; in another embodiment of the present invention, the amount of the compound is from 28 to 31 mass %; in another embodiment of the present invention, the amount of the compound is from 31 to 41 mass %; in another embodiment of the present invention, the amount of the compound is from 31 to 35 mass %; and in another embodiment of the present invention, the amount of the compound is from 35 to 40 mass %.

In the case where the viscosity of the liquid crystal composition of the present invention needs to be kept at a low level for allowing the liquid crystal composition to contribute to a high response speed, it is preferred that the lower limit of the above-mentioned range be low and that the upper limit thereof be low. In the case where the Tni of the liquid crystal composition of the present invention needs to be kept at a high level to allow the liquid crystal composition to have a high temperature stability, it is preferred that the lower limit of the above-mentioned range be low and that the upper limit thereof be low. In order to increase dielectric anisotropy for keeping driving voltage at a low level, it is preferred that the lower limit of the above-mentioned range be high and that the upper limit thereof be high.

In the case where the ring structure bonded to R^(M1) is a phenyl group (aromatic), R^(M1) is preferably a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, or an alkenyl group having 4 or 5 carbon atoms; in the case where the ring structure bonded to R^(M1) is a saturated ring such as cyclohexane, pyran, or dioxane, R^(M1) is preferably a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy groups having 1 to 4 carbon atoms, or a linear alkenyl group having 2 to 5 carbon atoms.

In the case where the liquid crystal composition needs to be chemically stable, it is preferred that the molecules of the compound represented by General Formula (M) be free from a chlorine atom. The amount of a chlorine-atom-containing compound in the liquid crystal composition is preferably in the range of 0 to 5 mass %, also preferably 0 to 3 mass %, also preferably 0 to 1 mass %, and also preferably 0 to 0.5 mass % relative to the total mass of the liquid crystal composition of the present invention; and it is also preferred that the liquid crystal composition be substantially free from a chlorine-atom-containing compound. The term “substantially free from a chlorine-atom-containing compound” refers to that only a compound unavoidably containing a chlorine atom, such as a compound generated as an impurity in production of another compound, is contained in the liquid crystal composition.

The compound represented by General Formula (M) is, for instance, preferably at least one compound selected from the group consisting of compounds represented by General Formula (VIII).

In General Formula (VIII), R⁸ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; X⁸¹ to X⁸⁵ each independently represent a hydrogen atom or a fluorine atom; and Y⁸ represents a fluorine atom or —OCF₃.

Such compounds can be used in any combination; a combination of the compounds is properly determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two of the compounds are used. In another embodiment of the present invention, three or more of the compounds are used.

In the liquid crystal composition of the present invention, the amount of the compound represented by General Formula (VIII) needs to be appropriately adjusted on the basis of intended properties such as resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, process adaptability, resistance to droplet stains and screen burn-in, and dielectric anisotropy.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (VIII) is in the range of 1 to 29 mass % in an embodiment of the present invention; in another embodiment of the present invention, the amount of the compound is from 1 to 24 mass %; in another embodiment of the present invention, the amount of the compound is from 1 to 19 mass %; in another embodiment of the present invention, the amount of the compound is from 1 to 5 mass %; in another embodiment of the present invention, the amount of the compound is from 1 to 3 mass %; in another embodiment of the present invention, the amount of the compound is from 4 to 10 mass %; in another embodiment of the present invention, the amount of the compound is from 6 to 10 mass %; in another embodiment of the present invention, the amount of the compound is from 9 to 15 mass %; and in another embodiment of the present invention, the amount of the compound is from 11 to 15 mass %.

In the case where the viscosity of the liquid crystal composition of the present invention needs to be kept at a low level for allowing the liquid crystal composition to contribute to a high response speed, it is preferred that the lower limit of the above-mentioned range be low and that the upper limit thereof be low. In the case where the Tni of the liquid crystal composition of the present invention needs to be kept at a high level to allow the liquid crystal composition to have a high temperature stability, it is preferred that the lower limit of the above-mentioned range be low and that the upper limit thereof be low. In order to increase dielectric anisotropy for keeping driving voltage at a low level, it is preferred that the lower limit of the above-mentioned range be high and that the upper limit thereof be high.

The compound represented by General Formula (VIII) is preferably a compound represented by General Formula (VIII-1).

In General Formula (VIII-1), R⁸ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; a combination of the compounds is properly determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two or more of the compounds are used.

In particular, the compound represented by General Formula (VIII-1) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (26.1) to (26.4), and more preferably the compound represented by Formula (26.1) and/or the compound represented by Formula (26.2).

In the case where only one compound is used as the compound represented by General Formula (i) in the liquid crystal composition, the amount of the compound represented by Formula (26.1) is preferably 1 mass % or more and less than 7 mass %, more preferably from 1 mass % to 5 mass %, and further preferably from 2 mass % to 5 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property.

In the case where at least two compounds are used as the compound represented by General Formula (i) in the liquid crystal composition, the amount of the compound represented by Formula (26.2) is preferably 0.5 mass % or more and less than 10 mass %, and more preferably from 1 mass % to 9 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property.

Alternatively or additionally, the compound represented by General Formula (VIII) is preferably a compound represented by General Formula (VIII-2).

In General Formula (VIII-2), R⁸ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; a combination of the compounds is properly determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two of the compounds are used. In another embodiment of the present invention, three or more of the compounds are used.

The amount of the compound represented by General Formula (VIII-2) is preferably in the range of 2.5 mass % to 25 mass %, also preferably 8 mass % to 25 mass %, also preferably 10 mass % to 20 mass %, and also preferably 12 mass % to 15 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence.

The compound represented by General Formula (VIII-2) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (27.1) to (27.4), and more preferably the compound represented by Formula (27.2).

Alternatively or additionally, the compound represented by General Formula (VIII) is preferably a compound represented by General Formula (VIII-3).

In General Formula (VIII-3), R⁸ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; a combination of the compounds is properly determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two or more of the compounds are used.

In view of resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence, the amount of the compound represented by General Formula (VIII-3) is preferably in the range of 0.5 mass % to 15 mass %, also preferably 0.5 mass % to 10 mass %, also preferably 0.5 mass % to 5 mass %, and also preferably 1 mass % to 5 mass % relative to the total mass of the liquid crystal composition of the present invention.

In particular, the compound represented by General Formula (VIII-3) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (26.11) to (26.14), more preferably the compound represented by Formula (26.11) and/or the compound represented by Formula (26.12), and further preferably the compound represented by Formula (26.12).

Alternatively or additionally, the compound represented by General Formula (VIII) is preferably a compound represented by General Formula (VIII-4).

In General Formula (VIII-4), R⁸ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, the compounds are preferably used alone or in combination.

The amount of the compound represented by General Formula (VIII-4) is appropriately adjusted on the basis of properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (VIII-4) is in the range of 1 to 25 mass % in an embodiment of the present invention; in another embodiment, the amount is from 2 to 25 mass %; in another embodiment, the amount is from 3 to 20 mass %; in another embodiment, the amount is from 3 to 13 mass %; in another embodiment, the amount is from 3 to 10 mass %; and in another embodiment, the amount is from 1 to 5 mass %.

In particular, the compound represented by General Formula (VIII-4), which is used in the liquid crystal composition of the present invention, is preferably at least one compound selected from the group consisting of compounds represented by Formulae (26.21) to (26.24); among these, it is preferred that the compound represented by Formula (26.24) be employed.

The compound represented by General Formula (M) is, for instance, preferably at least one compound selected from the group consisting of compounds represented by General Formula (IX).

In General Formula (IX), R⁹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; X⁹¹ and X⁹² each independently represent a hydrogen atom or a fluorine atom; Y⁹ represents a fluorine atom, a chlorine atom, or —OCF₃; and U⁹ represents a single bond, —COO—, or —CF₂O—.

Such compounds can be used in any combination; a combination of the compounds is properly determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two of the compounds are used. In another embodiment of the present invention, three of the compounds are used. In another embodiment of the present invention, four of the compounds are used. In another embodiment of the present invention, five of the compounds are used. In another embodiment of the present invention, six or more of the compounds are used.

In the liquid crystal composition of the present invention, the amount of the compound represented by General Formula (IX) needs to be appropriately adjusted on the basis of intended properties such as resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, process adaptability, resistance to droplet stains and screen burn-in, and dielectric anisotropy.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (IX) is in the range of 1 to 45 mass % in an embodiment of the present invention; in another embodiment of the present invention, the amount of the compound is from 1 to 40 mass %; in another embodiment of the present invention, the amount of the compound is from 1 to 35 mass %; in another embodiment of the present invention, the amount of the compound is from 1 to 30 mass %; in another embodiment of the present invention, the amount of the compound is from 5 to 30 mass %; in another embodiment of the present invention, the amount of the compound is from 5 to 10 mass %; in another embodiment of the present invention, the amount of the compound is from 10 to 15 mass %; in another embodiment of the present invention, the amount of the compound is from 15 to 21 mass %; in another embodiment of the present invention, the amount of the compound is from 20 to 30 mass %; and in another embodiment of the present invention, the amount of the compound is from 25 to 30 mass %.

In the case where the viscosity of the liquid crystal composition of the present invention needs to be kept at a low level for allowing the liquid crystal composition to contribute to a high response speed, it is preferred that the lower limit of the above-mentioned range be low and that the upper limit thereof be low. In the case where the Tni of the liquid crystal composition of the present invention needs to be kept at a high level for allowing the liquid crystal composition to serve for a reduction in screen burn-in, it is preferred that the lower limit of the above-mentioned range be low and that the upper limit thereof be low. In order to increase dielectric anisotropy for keeping driving voltage at a low level, it is preferred that the lower limit of the above-mentioned range be high and that the upper limit thereof be high.

The compound represented by General Formula (IX) is preferably a compound represented by General Formula (IX-1).

In General Formula (IX-1), R⁹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; X⁹² represents a hydrogen atom or a fluorine atom; and Y⁹ represents a fluorine atom or —OCF₃.

Such compounds can be used in any combination; a combination of the compounds is properly determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two of the compounds are used. In another embodiment of the present invention, three of the compounds are used. In another embodiment of the present invention, four or more of the compounds are used.

The compound represented by General Formula (IX-1) is preferably a compound represented by General Formula (IX-1-1).

In General Formula (IX-1-1), R⁹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; a combination of the compounds is properly determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. In an embodiment of the present invention, for example, one of such compounds is used. In another embodiment of the present invention, two of the compounds are used. In another embodiment of the present invention, three or more of the compounds are used.

The amount of the compound represented by General Formula (IX-1-1) is adjusted to be appropriate for an embodiment in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (IX-1-1) is in the range of 1 to 35 mass % in an embodiment of the present invention; in another embodiment of the present invention, the amount of the compound is from 1 to 30 mass %; in another embodiment of the present invention, the amount of the compound is from 1 to 25 mass %; in another embodiment of the present invention, the amount of the compound is from 1 to 20 mass %; in another embodiment of the present invention, the amount of the compound is from 1 to 4 mass %; in another embodiment of the present invention, the amount of the compound is from 6 to 10 mass %; and in another embodiment of the present invention, the amount of the compound is from 14 to 17 mass %.

The compound represented by General Formula (IX-1-1) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (28.1) to (28.5), more preferably the compound represented by Formula (28.3) and/or the compound represented by Formula (28.5), and further preferably the compound represented by Formula (28.5).

In the case where the liquid crystal composition of the present invention contains one or two compounds represented by General Formula (i), the amount of the compound represented by Formula (28.3) is preferably less than 7 mass %, and also preferably 1 mass % or more and less than 7 mass % relative to the total mass of the liquid crystal composition of the present invention.

In the liquid crystal composition of the present invention, the amount of the compound represented by Formula (28.5) is preferably in the range of 1 mass % to 20 mass %, also preferably 1 mass % to 15 mass %, also preferably 1 mass % to 10 mass %, and also preferably 1 mass % to 5 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

Alternatively or additionally, the compound represented by General Formula (IX-1) is preferably a compound represented by General Formula (IX-1-2).

In General Formula (IX-1-2), R⁹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, one to three of the compounds are preferably used, and one to four of the compounds are more preferably used.

The amount of the compound represented by General Formula (IX-1-2) is preferably in the range of 1 mass % to 30 mass %, also preferably 5 mass % to 30 mass %, also preferably 8 mass % to 30 mass %, also preferably 10 mass % to 25 mass %, also preferably 14 mass % to 22 mass %, and also preferably 16 mass % to 20 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

The compound represented by General Formula (IX-1-2) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (29.1) to (29.4), and more preferably the compound represented by Formula (29.2) and/or the compound represented by Formula (29.4).

Alternatively or additionally, the compound represented by General Formula (IX) is preferably a compound represented by General Formula (IX-2).

In General Formula (IX-2), R⁹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; X⁹¹ and X⁹² each independently represent a hydrogen atom or a fluorine atom; and Y⁹ represents a fluorine atom, a chlorine atom, or —OCF₃.

Such compounds can be used in any combination; a proper combination of the compounds for an embodiment is determined in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property. For example, one of such compounds is used in an embodiment of the present invention; two of the compounds are used in another embodiment, three of the compounds are used in another embodiment, four of the compounds are used in another embodiment, five of the compounds are used in another embodiment, and six or more of the compounds are used in another embodiment.

The compound represented by General Formula (IX-2) is preferably a compound represented by General Formula (IX-2-1).

In General Formula (IX-2-1), R⁹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, one to three of the compounds are preferably used.

The amount of the compound represented by General Formula (IX-2-1) is appropriately adjusted on the basis of properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence.

Relative to the total mass of the liquid crystal composition of the present invention, for instance, the amount of the compound represented by General Formula (IX-2-1) is in the range of 1 to 30 mass % in an embodiment of the present invention; in another embodiment, the amount of the compound is from 5 to 30 mass %; in another embodiment, the amount of the compound is from 5 to 25 mass %; in another embodiment, the amount of the compound is from 10 to 25 mass %; in another embodiment, the amount of the compound is from 10 to 20 mass %; and in another embodiment, the amount of the compound is from 13 to 17 mass %.

The compound represented by General Formula (IX-2-1) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (30.1) to (30.4), and more preferably the compound represented by Formula (30.1), the compound represented by Formula (30.2), and/or the compound represented by Formula (30.4).

Alternatively or additionally, the compound represented by General Formula (IX-2) is preferably a compound represented by General Formula (IX-2-2).

In General Formula (IX-2-2), R⁹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, one to three of the compounds are preferably used, and one to four of the compounds are more preferably used.

The amount of the compound represented by General Formula (IX-2-2) is adjusted to be appropriate for an embodiment in view of properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (IX-2-2) is in the range of 1 to 30 mass % in an embodiment of the present invention; in another embodiment, the amount is from 1 to 25 mass %; in another embodiment, the amount is from 1 to 20 mass %; in another embodiment, the amount is from 1 to 15 mass %; in another embodiment, the amount is from 3 to 7 mass %; and in another embodiment, the amount is from 9 to 15 mass %.

The compound represented by General Formula (IX-2-2) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (31.1) to (31.4), also preferably at least one compound selected from the group consisting of the compounds represented by Formulae (31.2) to (31.4), also preferably the compound represented by Formula (31.2) and/or the compound represented by Formula (31.4), and also preferably the compound represented by Formula (31.4).

In the case where the liquid crystal composition of the present invention contains at least two compounds represented by General Formula (i), the amount of the compound represented by Formula (31.2) is preferably in the range of 1 mass % to 25 mass %, also preferably 1 mass % to 20 mass %, also preferably 1 mass % to 15 mass %, and also preferably 9 mass % to 15 mass % relative to the total mass of the liquid crystal composition of the present invention.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i), the amount of the compound represented by Formula (31.2) is preferably in the range of 1 mass % to 25 mass %, also preferably 1 mass % to 20 mass %, also preferably 1 mass % to 15 mass %, and also preferably 1 mass % to 7 mass % relative to the total mass of the liquid crystal composition of the present invention.

In the liquid crystal composition of the present invention, the amount of the compound represented by Formula (31.4) is preferably in the range of 1 mass % to 25 mass %, also preferably 1 mass % to 20 mass %, also preferably 1 mass % to 15 mass %, also preferably 1 mass % to 11 mass %, and also preferably 1 mass % to 5 mass % relative to the total mass of the liquid crystal composition of the present invention.

Alternatively or additionally, the compound represented by General Formula (IX-2) is preferably a compound represented by General Formula (IX-2-3).

In General Formula (IX-2-3), R⁹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, one or two of the compounds are preferably used.

The amount of the compound represented by General Formula (IX-2-3) is preferably in the range of 1 mass % to 30 mass %, more preferably 3 mass % to 20 mass %, further preferably 6 mass % to 15 mass %, and further preferably 8 mass % to 10 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

The compound represented by General Formula (IX-2-3) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (32.1) to (32.4), and more preferably the compound represented by Formula (32.2) and/or the compound represented by Formula (32.4).

Alternatively or additionally, the compound represented by General Formula (IX-2) is preferably a compound represented by General Formula (IX-2-4).

In General Formula (IX-2-4), R⁹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The amount of the compound represented by General Formula (IX-2-4) is preferably in the range of 1 mass % to 25 mass %, also preferably 1 mass % to 20 mass %, also preferably 1 mass % to 15 mass %, also preferably 1 mass % to 12 mass %, also preferably 5 mass % to 12 mass %, and also preferably 7 mass % to 12 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

The compound represented by General Formula (IX-2-4) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (33.1) to (33.6), and more preferably the compound represented by Formula (33.1) and/or the compound represented by Formula (33.3).

Alternatively or additionally, the compound represented by General Formula (IX-2) is preferably a compound represented by General Formula (IX-2-5).

In General Formula (IX-2-5), R⁹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; a proper combination of the compounds for an embodiment is determined in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property. For example, one of such compounds is used in an embodiment of the present invention, two of the compounds are used in another embodiment, three of the compounds are used in another embodiment, and four or more of the compounds are used in another embodiment.

The amount of the compound represented by General Formula (IX-2-5) is adjusted to be proper for an embodiment in view of properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (IX-2-5) is in the range of 1 to 25 mass % in an embodiment of the present invention; in another embodiment, the amount is from 1 to 20 mass %; in another embodiment, the amount is from 1 to 15 mass %; in another embodiment, the amount is from 1 to 10 mass %; and in another embodiment, the amount is from 5 to 10 mass %.

In the case where the viscosity of the liquid crystal composition of the present invention needs to be kept at a low level for allowing the liquid crystal composition to contribute to a high response speed, it is preferred that the lower limit of the above-mentioned range be low and that the upper limit thereof be low. In the case where the Tni of the liquid crystal composition of the present invention needs to be kept at a high level for allowing the liquid crystal composition to serve for a reduction in screen-burn in, it is preferred that the lower limit of the above-mentioned range be low and that the upper limit thereof be low. In order to increase dielectric anisotropy for keeping driving voltage at a low level, it is preferred that the lower limit of the above-mentioned range be high and that the upper limit thereof be high.

The compound represented by General Formula (IX-2-5) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (34.1) to (34.7); more preferably the compound represented by Formula (34.1), the compound represented by Formula (34.2), the compound represented by Formula (34.3), and/or the compound represented by Formula (34.5); and further preferably the compound represented by Formula (34.1).

Alternatively or additionally, the compound represented by General Formula (IX) is preferably a compound represented by General Formula (IX-3).

In General Formula (IX-3), R⁹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; X⁹¹ and X⁹² each independently represent a hydrogen atom or a fluorine atom; and Y⁹ represents a fluorine atom, a chlorine atom, or —OCF₃.

The compound represented by General Formula (IX-3) is preferably a compound represented by General Formula (IX-3-1).

In General Formula (IX-3-1), R⁹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, one or two of the compounds are preferably used.

The amount of the compound represented by General Formula (IX-3-1) is preferably in the range of 3 mass % to 30 mass %, also preferably 7 mass % to 30 mass %, also preferably 13 mass % to 20 mass %, and also preferably 15 mass % to 18 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

The compound represented by General Formula (IX-3-1) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (35.1) to (35.4), and more preferably the compound represented by Formula (35.1) and/or the compound represented by Formula (35.2).

Alternatively or additionally, the compound represented by General Formula (M) is preferably a compound represented by General Formula (X).

In General Formula (X), X¹⁰¹ to X¹⁰⁴ each independently represent a fluorine atom or a hydrogen atom; Y¹⁰ represents a fluorine atom, a chlorine atom, or —OCF₃; Q¹⁰ represents a single bond or —CF₂O—; R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; and A¹⁰¹ and A¹⁰² each independently represent a 1,4-cyclohexylene group, a 1,4-phenylene group, or any one of groups represented by the following formulae, and a hydrogen atom of the 1,4-phenylene group is optionally substituted with a fluorine atom.

Such compounds can be used in any combination; a combination of the compounds is properly determined in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property. For instance, one of such compounds is used in an embodiment of the present invention, two of the compounds are used in another embodiment of the present invention, three of the compounds are used in another embodiment, four of the compounds are used in another embodiment, and five or more of the compounds are used in another embodiment.

The amount of the compound represented by General Formula (X) is adjusted to be proper for an embodiment in view of properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (X) is in the range of 1 to 35 mass % in an embodiment of the present invention; in another embodiment, the amount is from 1 to 30 mass %; in another embodiment, the amount is from 1 to 25 mass %; in another embodiment, the amount is from 5 to 25 mass %; in another embodiment, the amount is from 7 to 25 mass %; in another embodiment, the amount is from 18 to 25 mass %; in another embodiment, the amount is from 1 to 22 mass %; in another embodiment, the amount is from 5 to 22 mass %; in another embodiment, the amount is from 7 to 20 mass %; in another embodiment, the amount is from 7 to 13 mass %; in another embodiment, the amount is from 18 to 22 mass %; in another embodiment, the amount is from 9 to 15 mass %; and in another embodiment, the amount is from 7 to 15 mass %.

In the case where the liquid crystal composition of the present invention contains three compounds represented by General Formula (i), the amount of the compound represented by General Formula (X) is preferably in the range of 5 to 25 mass %, more preferably 7 to 20 mass %, and further preferably 9 to 15 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains two compounds represented by General Formula (i), the amount of the compound represented by General Formula (X) is preferably in the range of 7 to 25 mass %, more preferably 7 to 20 mass %, and further preferably 7 to 13 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i), the amount of the compound represented by General Formula (X) is preferably in the range of 18 to 25 mass %, and more preferably 18 to 22 mass % relative to the total mass of the liquid crystal composition.

In the case where the viscosity of the liquid crystal composition of the present invention needs to be kept at a low level for allowing the liquid crystal composition to contribute to a high response speed, it is preferred that the lower limit of the above-mentioned range be low and that the upper limit thereof be low. In the case where the liquid crystal composition needs to serve for a reduction in screen burn-in, it is preferred that the lower limit of the above-mentioned range be low and that the upper limit thereof be low. In order to increase dielectric anisotropy for keeping driving voltage at a low level, it is preferred that the lower limit of the above-mentioned range be high and that the upper limit thereof be high.

The compound represented by General Formula (X), which is used in the liquid crystal composition of the present invention, is preferably a compound represented by General Formula (X-1).

In General Formula (X-1), X¹⁰¹ to X¹⁰³ each independently represent a fluorine atom or a hydrogen atom; and R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; a proper combination of the compounds for an embodiment is determined in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property. For example, one of such compounds is used in an embodiment of the present invention, two of the compounds are used in another embodiment of the present invention, three of the compounds are used in another embodiment, four of the compounds are used in another embodiment, and five or more of the compounds are used in another embodiment.

The amount of the compound represented by General Formula (X-1) is appropriately adjusted in consideration of properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (X-1) is in the range of 1 to 20 mass % in an embodiment of the present invention; in another embodiment, the amount is from 1 to 15 mass %; in another embodiment, the amount is from 1 to 10 mass %; in another embodiment, the amount is from 1 to 5 mass %; and in another embodiment, the amount is from 1 to 3 mass %.

The compound represented by General Formula (X-1), which is used in the liquid crystal composition of the present invention, is preferably a compound represented by General Formula (X-1-1).

In General Formula (X-1-1), R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; a combination of the compounds is properly determined in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property. For instance, one of such compounds is used in an embodiment of the present invention, two of the compounds are used in another embodiment of the present invention, three of the compounds are used in another embodiment, and four or more of the compounds are used in another embodiment.

The amount of the compound represented by General Formula (X-1-1) is appropriately adjusted on the basis of properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (X-1-1) is in the range of 1 to 25 mass % in an embodiment of the present invention; in another embodiment, the amount is from 1 to 20 mass %; in another embodiment, the amount is from 1 to 15 mass %; in another embodiment, the amount is from 1 to 10 mass %; and in another embodiment, the amount is from 4 to 8 mass %.

In particular, the compound represented by General Formula (X-1-1), which is used in the liquid crystal composition of the present invention, is preferably at least one compound selected from the group consisting of compounds represented by Formulae (36.1) to (36.4), and more preferably the compound represented by Formula (36.1) and/or the compound represented by Formula (36.2).

Alternatively or additionally, the compound represented by General Formula (X-1), which is used in the liquid crystal composition of the present invention, is preferably a compound represented by General Formula (X-1-2).

In General Formula (X-1-2), R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The amount of the compound represented by General Formula (X-1-2) is appropriately adjusted on the basis of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (X-1-2) is in the range of 1 to 20 mass % in an embodiment of the present invention; in another embodiment, the amount is from 1 to 15 mass %; in another embodiment, the amount is from 1 to 10 mass %; in another embodiment, the amount is from 1 to 4 mass %; and in another embodiment, the amount is from 5.5 to 10 mass %.

In particular, the compound represented by General Formula (X-1-2), which is used in the liquid crystal composition of the present invention, is preferably at least one compound selected from the group consisting of compounds represented by Formulae (37.1) to (37.4), and more preferably the compound represented by Formula (37.2).

In the case where the liquid crystal composition of the present invention contains two compounds represented by General Formula (i), the amount of the compound represented by Formula (37.2) is preferably in the range of 1 to 20 mass %, more preferably 1 to 15 mass %, further preferably 1 to 10 mass %, and especially preferably 1 to 4 mass % relative to the total mass of the liquid crystal composition.

Alternatively or additionally, the compound represented by General Formula (X-1), which is used in the liquid crystal composition of the present invention, is preferably a compound represented by General Formula (X-1-3).

In General Formula (X-1-3), R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, the compounds are preferably used alone or in combination.

The amount of the compound represented by General Formula (X-1-3) is appropriately adjusted in consideration of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (X-1-3) is in the range of 1 to 20 mass % in an embodiment of the present invention; in another embodiment, the amount is from 1 to 15 mass %; in another embodiment, the amount is from 1 to 10 mass %; and in another embodiment, the amount is from 3 to 8 mass %.

In particular, the compound represented by General Formula (X-1-3), which is used in the liquid crystal composition of the present invention, is preferably at least one compound selected from the group consisting of compounds represented by Formulae (38.1) to (38.4), and more preferably the compound represented by Formula (38.2).

In the liquid crystal composition of the present invention, the amount of the compound represented by Formula (38.2) is preferably in the range of 1 mass % to 20 mass %, also preferably 1 mass % to 15 mass %, also preferably 1 mass % to 10 mass %, also preferably 3 mass % to 8 mass %, and also preferably 4 mass % to 7 mass % relative to the total mass of the liquid crystal composition of the present invention.

Alternatively or additionally, the compound represented by General Formula (X), which is used in the liquid crystal composition of the present invention, is preferably a compound represented by General Formula (X-2).

In General Formula (X-2), X¹⁰² and X¹⁰³ each independently represent a fluorine atom or a hydrogen atom; Y¹⁰ represents a fluorine atom, a chlorine atom, or —OCF₃; and R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, the compounds are preferably used alone or in combination.

The compound represented by General Formula (X-2), which is used in the liquid crystal composition of the present invention, is preferably a compound represented by General Formula (X-2-1).

In General Formula (X-2-1), R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination. In view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, at least one of the compounds is preferably used, and three or more of the compounds are more preferably used.

The amount of the compound represented by General Formula (X-2-1) is preferably in the range of 1 mass % to 25 mass %, also preferably 1 mass % to 20 mass %, also preferably 1 mass % to 15 mass %, and also preferably 1 mass % to 10 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

In particular, the compound represented by General Formula (X-2-1), which is used in the liquid crystal composition of the present invention, is preferably at least one compound selected from the group consisting of compounds represented by Formulae (39.1) to (39.4), and more preferably the compound represented by Formula (39.2).

In the liquid crystal composition of the present invention, the amount of the compound represented by Formula (39.2) is preferably in the range of 1 mass % to 25 mass %, also preferably 1 mass % to 20 mass %, also preferably 1 mass % to 15 mass %, also preferably 1 mass % to 10 mass %, and also preferably 3 mass % to 8 mass % relative to the total mass of the liquid crystal composition of the present invention.

Alternatively or additionally, the compound represented by General Formula (X-2), which is used in the liquid crystal composition of the present invention, is preferably a compound represented by General Formula (X-2-2).

In General Formula (X-2-2), R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, the compounds are preferably used alone or in combination.

The amount of the compound represented by General Formula (X-2-2) is preferably in the range of 3 mass % to 20 mass %, also preferably 6 mass % to 16 mass %, also preferably 9 mass % to 12 mass %, and also preferably 9 mass % to 10 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

In particular, the compound represented by General Formula (X-2-2), which is used in the liquid crystal composition of the present invention, is preferably at least one compound selected from the group consisting of compounds represented by Formulae (40.1) to (40.4), and more preferably the compound represented by Formula (40.2).

Alternatively or additionally, the compound represented by General Formula (X) is preferably a compound represented by General Formula (X-3).

In General Formula (X-3), X¹⁰² and X¹⁰³ each independently represent a fluorine atom or a hydrogen atom; and R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination. In view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, the compounds are preferably used alone or in combination.

The compound represented by General Formula (X-3), which is used in the liquid crystal composition of the present invention, is preferably a compound represented by General Formula (X-3-1).

In General Formula (X-3-1), R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, the compounds are preferably used alone or in combination.

The amount of the compound represented by General Formula (X-3-1) is appropriately adjusted on the basis of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (X-3-1) is preferably 0.5 mass % or more and less than 2 mass % in an embodiment of the present invention, and more preferably 0.5 mass % or more and 1.5 mass % or less.

In particular, the compound represented by General Formula (X-3-1), which is used in the liquid crystal composition of the present invention, is preferably at least one compound selected from the group consisting of compounds represented by Formulae (41.1) to (41.4), and more preferably the compound represented by Formula (41.2).

The amount of the compound represented by Formula (41.2) is preferably 0.5 mass % or more and less than 2 mass %, more preferably 0.5 mass % or more and 1.5 mass % or less, and further preferably 0.5 mass % or more and 1 mass % or less relative to the total mass of the liquid crystal composition of the present invention.

Alternatively or additionally, the compound represented by General Formula (X) is preferably a compound represented by General Formula (X-4).

In General Formula (X-4), X¹⁰² represents a fluorine atom or a hydrogen atom; and R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, at least one of the compounds is preferably used, and three or more of the compounds are more preferably used.

The compound represented by General Formula (X-4), which is used in the liquid crystal composition of the present invention, is preferably a compound represented by General Formula (X-4-1).

In General Formula (X-4-1), R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, at least one of the compounds is preferably used, and three or more of the compounds are more preferably used.

The amount of the compound represented by General Formula (X-4-1) is appropriately adjusted on the basis of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

The amount of the compound represented by General Formula (X-4-1) is preferably in the range of 1 mass % to 20 mass %, also preferably 1 mass % to 15 mass %, also preferably 1 mass % to 10 mass %, and also preferably 1 mass % to 5 mass % relative to the total mass of the liquid crystal composition of the present invention.

In particular, the compound represented by General Formula (X-4-1), which is used in the liquid crystal composition of the present invention, is preferably at least one compound selected from the group consisting of compounds represented by Formulae (42.1) to (42.4), and more preferably the compound represented by Formula (42.3).

The amount of the compound represented by Formula (42.3) is preferably in the range of 1 mass % to 20 mass %, also preferably 1 mass % to 15 mass %, also preferably 1 mass % to 10 mass %, and also preferably 1 mass % to 5 mass % relative to the total mass of the liquid crystal composition of the present invention.

Alternatively or additionally, the compound represented by General Formula (X), which is used in the liquid crystal composition of the present invention, is preferably a compound represented by General Formula (X-4-2).

In General Formula (X-4-2), R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, at least one of the compounds is preferably used, and three or more of the compounds are more preferably used.

The amount of the compound represented by General Formula (X-4-2) is preferably in the range of 1 mass % to 20 mass %, also preferably 1 mass % to 15 mass %, also preferably 1 mass % to 10 mass %, and also preferably 3 mass % to 7 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

In particular, the compound represented by General Formula (X-4-2), which is used in the liquid crystal composition of the present invention, is preferably at least one compound selected from the group consisting of compounds represented by Formulae (42.11) to (42.14), and more preferably the compound represented by Formula (42.13) and/or the compound represented by Formula (42.14).

Alternatively or additionally, the compound represented by General Formula (X), which is used in the liquid crystal composition of the present invention, is preferably a compound represented by General Formula (X-4-3).

In General Formula (X-4-3), R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, at least one of the compounds is preferably used, and three or more of the compounds are more preferably used.

The amount of the compound represented by General Formula (X-4-3) is preferably in the range of 2 mass % to 20 mass %, also preferably 5 mass % to 17 mass %, also preferably 10 mass % to 15 mass %, and also preferably 10 mass % to 13 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

In particular, the compound represented by General Formula (X-4-3), which is used in the liquid crystal composition of the present invention, is preferably at least one compound selected from the group consisting of compounds represented by Formulae (42.21) to (42.24), and more preferably the compound represented by Formula (42.22).

Alternatively or additionally, the compound represented by General Formula (X) is preferably a compound represented by General Formula (X-5).

In General Formula (X-5), X¹⁰² represents a fluorine atom or a hydrogen atom; and R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, at least one of the compounds is preferably used, and three or more of the compounds are more preferably used.

The compound represented by General Formula (X-5) is preferably a compound represented by General Formula (X-5-1).

In General Formula (X-5-1), R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, at least one of the compounds is preferably used, and three or more of the compounds are more preferably used.

The amount of the compound represented by General Formula (X-5-1) is preferably in the range of 2 mass % to 20 mass %, also preferably 5 mass % to 17 mass %, also preferably 10 mass % to 15 mass %, and also preferably 10 mass % to 13 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

In particular, the compound represented by General Formula (X-5-1) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (43.1) to (43.4), and more preferably the compound represented by Formula (43.2).

Alternatively or additionally, the compound represented by General Formula (X) is preferably a compound represented by General Formula (X-6).

In General Formula (X-6), R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, the compounds are preferably used alone or in combination.

The amount of the compound represented by General Formula (X-6) is appropriately adjusted in consideration of properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (X-6) is in the range of 1 to 25 mass % in an embodiment of the present invention; in another embodiment, the amount is from 1 to 20 mass %; in another embodiment, the amount is from 1 to 15 mass %; and in another embodiment, the amount is from 1 to 12 mass %.

In particular, the compound represented by General Formula (X-6) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (44.1) to (44.4), and more preferably the compound represented by Formula (44.1) and/or the compound represented by Formula (44.2).

In the case where the liquid crystal composition of the present invention contains three compounds represented by General Formula (i), the total amount of the compounds represented by Formulae (44.1) and (44.2) is preferably in the range of 1 to 25 mass %, more preferably 4 to 21 mass %, further preferably 7 to 17 mass %, and further preferably 9 to 15 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains two compounds represented by General Formula (i), the total amount of the compounds represented by Formulae (44.1) and (44.2) is preferably in the range of 1 to 25 mass %, more preferably 3 to 20 mass %, further preferably 5 to 15 mass %, and further preferably 6 to 12 mass % relative to the total mass of the liquid crystal composition.

The compound represented by General Formula (M), which can be contained in the liquid crystal composition of the present invention, may be a compound which is represented by General Formula (X′-7) and which is analogous to the compound represented by General Formula (X).

In General Formula (X′-7), R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, the compounds are preferably used alone or in combination.

The amount of the compound represented by General Formula (X′-7) is appropriately adjusted on the basis of properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (X′-7) is in the range of 1 to 20 mass % in an embodiment of the present invention; in another embodiment, the amount is from 1 to 15 mass %; in another embodiment, the amount is from 1 to 10 mass %; and in another embodiment, the amount is from 1 to 5 mass %.

In particular, the compound represented by General Formula (X′-7), which is used in the liquid crystal composition of the present invention, is preferably at least one compound selected from the group consisting of compounds represented by Formulae (44.11) to (44.14), and more preferably the compound represented by Formula (44.13).

Alternatively or additionally, the compound represented by General Formula (X) is preferably a compound represented by General Formula (X-8).

In General Formula (X-8), R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, the compounds are preferably used alone or in combination.

The amount of the compound represented by General Formula (X-8) is appropriately adjusted on the basis of properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (X-8) is in the range of 1 to 25 mass % in an embodiment of the present invention; in another embodiment, the amount is from 1 to 20 mass %; in another embodiment, the amount is from 1 to 15 mass %; in another embodiment, the amount is from 1 to 10 mass %; and in another embodiment, the amount is from 1 to 5 mass %.

In particular, the compound represented by General Formula (X-8) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (44.21) to (44.24), and more preferably the compound represented by Formulae (44.22).

Alternatively or additionally, the compound represented by General Formula (X) is preferably a compound represented by General Formula (X-9).

In General Formula (X-9), R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, at least one of the compounds is preferably used, and three or more of the compounds are more preferably used.

The amount of the compound represented by General Formula (X-9) is preferably in the range of 1 mass % to 25 mass %, also preferably 3 mass % to 20 mass %, also preferably 5 mass % to 16 mass %, and also preferably 7 mass % to 12 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

In particular, the compound represented by General Formula (X-9) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (44.31) to (44.34), and more preferably the compound represented by Formula (44.32).

Alternatively or additionally, the compound represented by General Formula (X) is preferably at least one compound selected from the group consisting of compounds represented by General Formula (XI).

In General Formula (XI), X¹¹¹ to X¹¹⁷ each independently represent a fluorine atom or a hydrogen atom, and at least one of X¹¹¹ to X¹¹⁷ represents a fluorine atom; R¹¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; Y¹¹ represents a fluorine atom or —OCF₃; and the compounds represented by General Formula (XI) excludes the compounds represented by General Formula (i).

Such compounds can be used in any combination; for example, in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, one of the compounds is preferably used in an embodiment of the present invention, two of the compounds are preferably used in combination in another embodiment, and three or more of the compounds are preferably used in combination in another embodiment.

The amount of the compound represented by General Formula (XI) is appropriately adjusted on the basis of properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (XI) is in the range of 1 to 30 mass % in an embodiment of the present invention; in another embodiment, the amount is from 1 to 25 mass %; in another embodiment, the amount is from 1 to 23 mass %; in another embodiment, the amount is from 1 to 22 mass %; in another embodiment, the amount is from 1 to 18 mass %; in another embodiment, the amount is from 1 to 16 mass %; in another embodiment, the amount is from 1 to 15 mass %; in another embodiment, the amount is from 1 to 13 mass %; in another embodiment, the amount is from 1 to 12 mass %; in another embodiment, the amount is from 1 to 10 mass %; in another embodiment, the amount is from 1 to 7 mass %; in another embodiment, the amount is from 1 to 6 mass %; in another embodiment, the amount is from 1 to 5 mass %; in another embodiment, the amount is from 1 to 4 mass %; in another embodiment, the amount is from 2 to 22 mass %; in another embodiment, the amount is from 4 to 22 mass %; in another embodiment, the amount is from 7 to 22 mass %; in another embodiment, the amount is from 9 to 22 mass %; in another embodiment, the amount is from 10 to 22 mass %; in another embodiment, the amount is from 13 to 22 mass %; in another embodiment, the amount is from 15 to 22 mass %; in another embodiment, the amount is from 16 to 22 mass %; in another embodiment, the amount is from 18 to 22 mass %; in another embodiment, the amount is from 20 to 22 mass %; in another embodiment, the amount is from 2 to 6 mass %; in another embodiment, the amount is from 2 to 5 mass %; in another embodiment, the amount is from 9 to 10 mass %; and in another embodiment, the amount is from 10 to 12 mass %.

In the case where the liquid crystal composition of the present invention is used in a liquid crystal display device having a small cell gap, the appropriate amount of the compound represented by General Formula (XI) is at a higher level. In the case where the liquid crystal composition of the present invention is used in a liquid crystal display device which is driven at a small driving voltage, the appropriate amount of the compound represented by General Formula (XI) is at a higher level. In the case where the liquid crystal composition of the present invention is used in a liquid crystal display device which is used in a low-temperature environment, the appropriate amount of the compound represented by General Formula (XI) is at a lower level. In the case where the liquid crystal composition is used in a liquid crystal display device which quickly responds, the appropriate amount of the compound represented by General Formula (XI) is at a lower level.

The compound represented by General Formula (XI), which is used in the liquid crystal composition of the present invention, is preferably a compound represented by General Formula (XI-2).

In General Formula (XI-2), R¹¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; a proper combination of the compounds for an embodiment is determined in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property. For example, one of the compounds is used in an embodiment of the present invention, two of the compounds are used in combination in another embodiment, and three or more of the compounds are used in combination in another embodiment.

The amount of the compound represented by General Formula (XI-2) is preferably in the range of 1 mass % to 20 mass %, also preferably 1 mass % to 15 mass %, also preferably 1 mass % to 10 mass %, also preferably 1 mass % to 5 mass %, and also preferably 1 mass % to 3 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

In particular, the compound represented by General Formula (XI-2), which is used in the liquid crystal composition of the present invention, is preferably at least one compound selected from the group consisting of compounds represented by Formulae (45.11) to (45.14), more preferably at least one compound selected from the group consisting of the compounds represented by Formulae (45.12) to (45.14), and further preferably the compound represented by Formula (45.12).

Alternatively or additionally, the compound represented by General Formula (X) is preferably at least one compound selected from the group consisting of compounds represented by General Formula (XII).

In General Formula (XII), X¹²¹ to X¹²⁶ each independently represent a fluorine atom or a hydrogen atom; R¹²⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; and Y¹² represents a fluorine atom or —OCF₃.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, it is preferred that one to three or more of the compounds be appropriately used, and it is more preferred that one to four or more of the compounds be appropriately used.

The compound represented by General Formula (XII), which is used in the liquid crystal composition of the present invention, is preferably a compound represented by General Formula (XII-1).

In General Formula (XII-1), R¹²⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, it is preferred that one or two or more of the compounds be appropriately used, and it is more preferred that one to three or more of the compounds be appropriately used.

The amount of the compound represented by General Formula (XII-1) is preferably in the range of 1 mass % to 15 mass %, also preferably 2 mass % to 10 mass %, also preferably 3 mass % to 8 mass %, and also preferably 4 mass % to 6 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

In particular, the compound represented by General Formula (XII-1), which is used in the liquid crystal composition of the present invention, is preferably at least one compound selected from the group consisting of compounds represented by Formulae (46.1) to (46.4), and more preferably at least one compound selected from the group consisting of the compounds represented by Formulae (46.2) to (46.4).

Alternatively or additionally, the compound represented by General Formula (XII) is preferably a compound represented by General Formula (XII-2).

In General Formula (XII-2), R¹²⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, it is preferred that one or two or more of the compounds be appropriately used, and it is more preferred that one to three or more of the compounds be appropriately used.

The amount of the compound represented by General Formula (XII-2) is preferably in the range of 1 mass % to 20 mass %, also preferably 3 mass % to 20 mass %, also preferably 4 mass % to 17 mass %, also preferably 6 mass % to 15 mass %, and also preferably 9 mass % to 13 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

In particular, the compound represented by General Formula (XII-2), which is used in the liquid crystal composition of the present invention, is preferably at least one compound selected from the group consisting of compounds represented by Formulae (47.1) to (47.4), and more preferably at least one compound selected from the group consisting of the compounds represented by Formulae (47.2) to (47.4).

Alternatively or additionally, the compound represented by General Formula (M) is preferably at least one compound selected from the group consisting of compounds represented by General Formula (XIII).

In General Formula (XIII), X¹³¹ to X¹³⁵ each independently represent a fluorine atom or a hydrogen atom; R¹³⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; and Y¹³ represents a fluorine atom or —OCF₃.

Such compounds can be used in any combination; one or two of the compounds are preferably used, one to three of the compounds are more preferably used, and one to four of the compounds are further preferably used.

The amount of the compound represented by General Formula (XIII) is appropriately adjusted on the basis of properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (XIII) is in the range of 2 to 30 mass % in an embodiment of the present invention; in another embodiment, the amount is from 4 to 30 mass %; in another embodiment, the amount is from 5 to 30 mass %; in another embodiment, the amount is from 7 to 30 mass %; in another embodiment, the amount is from 9 to 30 mass %; in another embodiment, the amount is from 11 to 30 mass %; in another embodiment, the amount is from 13 to 30 mass %; in another embodiment, the amount is from 14 to 30 mass %; in another embodiment, the amount is from 16 to 30 mass %; and in another embodiment, the amount is from 20 to 30 mass %.

Relative to the total mass of the liquid crystal composition of the present invention, for instance, the amount of the compound represented by General Formula (XIII) is in the range of 2 to 25 mass % in an embodiment of the present invention; in another embodiment, the amount of the compound is from 2 to 20 mass %; in another embodiment, the amount of the compound is from 2 to 15 mass %; in another embodiment, the amount of the compound is from 2 to 10 mass %; and in another embodiment, the amount of the compound is from 2 to 5 mass %.

In the case where the liquid crystal composition of the present invention is used in a liquid crystal display device having a small cell gap, the appropriate amount of the compound represented by General Formula (XIII) is at a higher level. In the case where the liquid crystal composition of the present invention is used in a liquid crystal display device which is driven at a small driving voltage, the appropriate amount of the compound represented by General Formula (XIII) is at a higher level. In the case where the liquid crystal composition of the present invention is used in a liquid crystal display device which is used in a low-temperature environment, the appropriate amount of the compound represented by General Formula (XIII) is at a lower level. In the case where the liquid crystal composition is used in a liquid crystal display device which quickly responds, the appropriate amount of the compound represented by General Formula (XIII) is at a lower level.

The compound represented by General Formula (XIII) is preferably a compound represented by General Formula (XIII-1).

In General Formula (XIII-1), R¹³⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The amount of the compound represented by General Formula (XIII-1) is preferably in the range of 1 mass % to 25 mass %, also preferably 3 mass % to 25 mass %, also preferably 5 mass % to 20 mass %, and also preferably 10 mass % to 15 mass % relative to the total mass of the liquid crystal composition of the present invention.

The compound represented by General Formula (XIII-1) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (48.1) to (48.4), and more preferably the compound represented by Formula (48.2).

Alternatively or additionally, the compound represented by General Formula (XIII) is preferably a compound represented by General Formula (XIII-2).

In General Formula (XIII-2), R¹³⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; at least one of the compounds is preferably used.

The amount of the compound represented by General Formula (XIII-2) is preferably in the range of 1 mass % to 25 mass %, also preferably 1 mass % to 20 mass %, also preferably 1 mass % to 15 mass %, also preferably 1 mass % to 10 mass %, and also preferably 1 mass % to 5 mass % relative to the total mass of the liquid crystal composition of the present invention.

The compound represented by General Formula (XIII-2) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (49.1) to (49.4), and more preferably the compound represented by Formula (49.1) and/or the compound represented by Formula (49.2).

Alternatively or additionally, the compound represented by General Formula (XIII) is preferably a compound represented by General Formula (XIII-3).

In General Formula (XIII-3), R¹³⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; one or two of the compounds are preferably used.

The amount of the compound represented by General Formula (XIII-3) is preferably in the range of 2 mass % to 20 mass %, also preferably 4 mass % to 20 mass %, also preferably 9 mass % to 17 mass %, and also preferably 11 mass % to 14 mass % relative to the total mass of the liquid crystal composition of the present invention.

The compound represented by General Formula (XIII-3) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (50.1) to (50.4), and more preferably the compound represented by Formula (50.1) and/or the compound represented by Formula (50.2).

Alternatively or additionally, the compound represented by General Formula (M) is preferably at least one compound selected from the group consisting of compounds represented by General Formula (XIV).

In General Formula (XIV), R¹⁴⁰ represents an alkyl group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, or an alkoxy group having 1 to 7 carbon atoms; X¹⁴¹ to X¹⁴⁴ each independently represent a fluorine atom or a hydrogen atom; Y¹⁴ represents a fluorine atom, a chlorine atom, or OCF₃; Q¹⁴ represents a single bond, —COO—, or —CF₂O—; and m¹⁴ represents 0 or 1.

Such compounds can be used in any combination; a proper combination of the compounds for an embodiment is determined in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property. For example, one of such compounds is used in an embodiment of the present invention, two of the compounds are used in another embodiment of the present invention, three of the compounds are used in another embodiment of the present invention, four of the compounds are used in another embodiment of the present invention, five of the compounds are used in another embodiment of the present invention, and six or more of the compounds are used in another embodiment of the present invention.

The amount of the compound represented by General Formula (XIV) is appropriately adjusted on the basis of properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (XIV) is in the range of 1 to 30 mass % in an embodiment of the present invention; in another embodiment, the amount is from 1 to 25 mass %; in another embodiment, the amount is from 1 to 20 mass %; in another embodiment, the amount is from 1 to 15 mass %; and in another embodiment, the amount is from 1 to 12 mass %.

In the case where the liquid crystal composition of the present invention is used in a liquid crystal display device which is driven at a small driving voltage, the appropriate amount of the compound represented by General Formula (XIV) is at a higher level. In the case where the liquid crystal composition is used in a liquid crystal display device which quickly responds, the appropriate amount of the compound represented by General Formula (XIV) is at a lower level.

The compound represented by General Formula (XIV) is preferably a compound represented by General Formula (XIV-1).

In General Formula (XIV-1), R¹⁴⁰ represents an alkyl group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, or an alkoxy group having 1 to 7 carbon atoms; and Y¹⁴ represents a fluorine atom, a chlorine atom, or —OCF₃.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, one to three of the compounds are preferably used.

The compound represented by General Formula (XIV-1) is preferably a compound represented by General Formula (XIV-1-1).

In General Formula (XIV-1-1), R¹⁴⁰ represents an alkyl group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, or an alkoxy group having 1 to 7 carbon atoms.

The amount of the compound represented by General Formula (XIV-1-1) is appropriately adjusted on the basis of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

The amount of the compound represented by General Formula (XIV-1-1) is, for instance, preferably in the range of 5 to 20 mass %, more preferably 7 to 20 mass %, and further preferably 7 to 15 mass % relative to the total mass of the liquid crystal composition of the present invention.

In particular, the compound represented by General Formula (XIV-1-1) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (51.1) to (51.4), and more preferably the compound represented by Formula (51.1).

The amount of the compound represented by Formula (51.1) is, for instance, preferably not less than 5 mass %, more preferably from 5 to 20 mass %, further preferably from 7 to 20 mass %, and especially preferably from 7 to 15 mass % relative to the total mass of the liquid crystal composition of the present invention.

Alternatively or additionally, the compound represented by General Formula (XIV-1) is preferably a compound represented by General Formula (XIV-1-2).

In General Formula (XIV-1-2), R¹⁴⁰ represents an alkyl group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, or an alkoxy group having 1 to 7 carbon atoms.

The amount of the compound represented by General Formula (XIV-1-2) is preferably in the range of 1 mass % to 15 mass %, also preferably 3 mass % to 13 mass %, also preferably 5 mass % to 11 mass %, and also preferably 7 mass % to 9 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

In particular, the compound represented by General Formula (XIV-1-2) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (52.1) to (52.4), and more preferably the compound represented by Formula (52.4).

Alternatively or additionally, the compound represented by General Formula (XIV) is preferably a compound represented by General Formula (XIV-2).

In General Formula (XIV-2), R¹⁴⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; X¹⁴¹ to X¹⁴⁴ each independently represent a fluorine atom or a hydrogen atom; and Y¹⁴ represents a fluorine atom, a chlorine atom, or —OCF₃.

Such compounds can be used in any combination; a proper combination of the compounds for an embodiment is determined in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property. For example, one of such compounds is used in an embodiment of the present invention, two of the compounds are used in another embodiment of the present invention, three of the compounds are used in another embodiment of the present invention, four of the compounds are used in another embodiment of the present invention, and five or more of the compounds are used in another embodiment of the present invention.

The amount of the compound represented by General Formula (XIV-2) is appropriately adjusted on the basis of properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence.

In an embodiment of the present invention, for example, the amount of the compound represented by General Formula (XIV-2) is preferably in the range of 1 to 30 mass %, more preferably 1 to 25 mass %, and further preferably 1 to 20 mass % relative to the total mass of the liquid crystal composition of the present invention.

In the case where the liquid crystal composition of the present invention is used in a liquid crystal display device which is driven at a small driving voltage, the appropriate amount of the compound represented by General Formula (XIV-2) is at a higher level. In the case where the liquid crystal composition is used in a liquid crystal display device which quickly responds, the appropriate amount of the compound represented by General Formula (XIV-2) is at a lower level.

The compound represented by General Formula (XIV-2) is preferably a compound represented by General Formula (XIV-2-1).

In General Formula (XIV-2-1), R¹⁴⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The amount of the compound represented by General Formula (XIV-2-1) is preferably in the range of 1 mass % to 15 mass %, also preferably 3 mass % to 13 mass %, also preferably 5 mass % to 11 mass %, and also preferably 7 mass % to 9 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

In particular, the compound represented by General Formula (XIV-2-1) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (53.1) to (53.4), and more preferably the compound represented by Formula (53.4).

Alternatively or additionally, the compound represented by General Formula (XIV-2) is preferably a compound represented by General Formula (XIV-2-2).

In General Formula (XIV-2-2), R¹⁴⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The amount of the compound represented by General Formula (XIV-2-2) is preferably in the range of 1 mass % to 30 mass %, also preferably 1 mass % to 25 mass %, also preferably 1 mass % to 20 mass %, also preferably 4 mass % to 20 mass %, and also preferably 8 mass % to 20 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

In particular, the compound represented by General Formula (XIV-2-2) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (54.1) to (54.4), and more preferably the compound represented by Formula (54.1), the compound represented by Formula (54.2), and/or the compound represented by Formula (54.4).

In the liquid crystal composition of the present invention, the amount of the compound represented by Formula (54.1) is preferably in the range of 0.5 mass % to 20 mass %, also preferably 0.5 mass % to 15 mass %, also preferably 0.5 mass % to 10 mass %, and also preferably 0.5 mass % to 5 mass % relative to the total mass of the liquid crystal composition of the present invention.

In the liquid crystal composition of the present invention, the amount of the compound represented by Formula (54.2) is preferably in the range of 1 mass % to 30 mass %, also preferably 1 mass % to 25 mass %, also preferably 1 mass % to 20 mass %, and also preferably 3 mass % to 17 mass % relative to the total mass of the liquid crystal composition of the present invention.

In the liquid crystal composition of the present invention, the amount of the compound represented by Formula (54.4) is preferably in the range of 1 mass % to 25 mass %, also preferably 1 mass % to 20 mass %, also preferably 1 mass % to 15 mass %, and also preferably 1 mass % to 10 mass % relative to the total mass of the liquid crystal composition of the present invention.

Alternatively or additionally, the compound represented by General Formula (XIV-2) is preferably a compound represented by General Formula (XIV-2-3).

In General Formula (XIV-2-3), R¹⁴⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The amount of the compound represented by General Formula (XIV-2-3) is preferably in the range of 5 mass % to 30 mass %, also preferably 9 mass % to 27 mass %, also preferably 12 mass % to 24 mass %, and also preferably 12 mass % to 20 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

In particular, the compound represented by General Formula (XIV-2-3) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (55.1) to (55.4), and more preferably the compound represented by Formula (55.2) and/or the compound represented by Formula (55.4).

Alternatively or additionally, the compound represented by General Formula (XIV-2) is preferably a compound represented by General Formula (XIV-2-4).

In General Formula (XIV-2-4), R¹⁴⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; a proper combination of the compounds for an embodiment is determined in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property. For example, one of such compounds is used in an embodiment of the present invention, two of the compounds are used in another embodiment of the present invention, and three or more of the compounds are used in another embodiment of the present invention.

The amount of the compound represented by General Formula (XIV-2-4) is adjusted to be proper for an embodiment on the basis of properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (XIV-2-4) is in the range of 1 to 25 mass % in an embodiment of the present invention; in another embodiment, the amount is from 1 to 20 mass %; in another embodiment, the amount is from 1 to 15 mass %; in another embodiment, the amount is from 1 to 10 mass %; and in another embodiment, the amount is from 3 to 8 mass %.

In the case where the liquid crystal composition of the present invention is used in a liquid crystal display device which is driven at a small driving voltage, the appropriate amount of the compound represented by General Formula (XIV-2-4) is at a higher level. In the case where the liquid crystal composition is used in a liquid crystal display device which quickly responds, the appropriate amount of the compound represented by General Formula (XIV-2-4) is at a lower level.

In particular, the compound represented by General Formula (XIV-2-4) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (56.1) to (56.4), and more preferably the compound represented by Formula (56.1), the compound represented by Formula (56.2), and/or the compound represented by Formula (56.4).

Alternatively or additionally, the compound represented by General Formula (XIV-2) is preferably a compound represented by General Formula (XIV-2-5).

In General Formula (XIV-2-5), R¹⁴⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The amount of the compound represented by General Formula (XIV-2-5) is preferably in the range of 5 mass % to 25 mass %, also preferably 10 mass % to 22 mass %, also preferably 13 mass % to 18 mass %, and also preferably 13 mass % to 15 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

In particular, the compound represented by General Formula (XIV-2-5) is at least one compound selected from the group consisting of compounds represented by Formulae (57.1) to (57.4). Among these, the compound represented by Formula (57.1) is preferably employed.

Alternatively or additionally, the compound represented by General Formula (XIV-2) is preferably a compound represented by General Formula (XIV-2-6).

In General Formula (XIV-2-6), R¹⁴⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The amount of the compound represented by General Formula (XIV-2-6) is preferably in the range of 5 mass % to 25 mass %, also preferably 10 mass % to 22 mass %, also preferably 15 mass % to 20 mass %, and also preferably 15 mass % to 17 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, and another property.

In particular, the compound represented by General Formula (XIV-2-6) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (58.1) to (58.4), and more preferably the compound represented by Formula (58.2).

Alternatively or additionally, the compound represented by General Formula (XIV) is preferably a compound represented by General Formula (XIV-3).

In General Formula (XIV-3), R¹⁴⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; a combination of the compounds is properly determined on the basis of desired properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. For example, one of such compounds is used in an embodiment of the present invention, and two or more of the compounds are used in another embodiment of the present invention.

The amount of the compound represented by General Formula (XIV-3) is preferably in the range of 1 mass % to 20 mass %, also preferably 1 mass % to 15 mass %, and also preferably 1 mass % to 10 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property.

In particular, the compound represented by General Formula (XIV-3) is preferably at least one compound selected from the group consisting of compounds represented by Formulae (61.1) to (61.4), and more preferably the compound represented by Formula (61.1) and/or the compound represented by Formula (61.2).

Alternatively or additionally, the compound represented by General Formula (M) is preferably a compound represented by General Formula (XV).

In General Formula (XV), R¹⁵⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; and A¹⁵¹ represents a 1,4-cyclohexylene group or a 1,4-phenylene group, and a hydrogen atom of the 1,4-phenylene group is optionally substituted with a fluorine atom.

Such compounds can be used in any combination; a combination of the compounds is properly determined in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property. For instance, one of such compounds is used in an embodiment of the present invention, two of the compounds are used in another embodiment of the present invention, three of the compounds are used in another embodiment, four of the compounds are used in another embodiment, and five or more of the compounds are used in another embodiment.

The amount of the compound represented by General Formula (XV) is adjusted to be proper for an embodiment on the basis of properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence. Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (XV) is in the range of 0.5 to 25 mass % in an embodiment of the present invention; in another embodiment, the amount is from 0.5 to 20 mass %; in another embodiment, the amount is from 0.5 to 15 mass %; in another embodiment, the amount is from 0.5 to 10 mass %; and in another embodiment, the amount is from 0.5 to 7 mass %.

The compound represented by General Formula (XV), which is used in the liquid crystal composition of the present invention, is preferably a compound represented by General Formula (XV-1).

In General Formula (XV-1), R¹⁵⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, the compounds are preferably used alone or in combination.

The amount of the compound represented by General Formula (XV-1) is appropriately adjusted on the basis of properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence.

Relative to the total mass of the liquid crystal composition of the present invention, for example, the amount of the compound represented by General Formula (XV-1) is in the range of 1 to 25 mass % in an embodiment of the present invention; in another embodiment, the amount is from 1 to 20 mass %; in another embodiment, the amount is from 1 to 10 mass %; and in another embodiment, the amount is from 3 to 7 mass %.

In particular, the compound represented by General Formula (XV-1), which is used in the liquid crystal composition of the present invention, is preferably at least one compound selected from the group consisting of compounds represented by Formulae (59.1) to (59.4), and more preferably the compound represented by Formula (59.1).

Alternatively or additionally, the compound represented by General Formula (XV) is preferably a compound represented by General Formula (XV-2).

In General Formula (XV-2), R¹⁵⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, the compounds are preferably used alone or in combination.

The amount of the compound represented by General Formula (XV-2) is appropriately adjusted on the basis of properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence.

The amount of the compound represented by General Formula (XV-2) is, for instance, preferably in the range of 0.5 mass % to 20 mass %, also preferably 0.5 mass % to 15 mass %, also preferably 0.5 mass % to 10 mass %, and also preferably 1 mass % to 5 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property.

In particular, the compound represented by General Formula (XV-2), which is used in the liquid crystal composition of the present invention, is preferably at least one compound selected from the group consisting of compounds represented by Formulae (60.1) to (60.4), and more preferably the compound represented by Formula (60.1) and/or the compound represented by Formula (60.2).

Alternatively or additionally, the compound represented by General Formula (M) is preferably a compound represented by General Formula (XV′-1).

In General Formula (XV′-1), R¹⁵⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

Such compounds can be used in any combination; in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property, the compounds are preferably used alone or in combination.

The amount of the compound represented by General Formula (XV′-1) is appropriately adjusted on the basis of properties such as resistance to resolution at low temperature, transition temperature, electric reliability, and birefringence.

The amount of the compound represented by General Formula (XV′-1) is, for instance, preferably in the range of 1 mass % to 20 mass %, also preferably 1 mass % to 15 mass %, also preferably 1 mass % to 10 mass %, and also preferably 1 mass % to 6 mass % relative to the total mass of the liquid crystal composition of the present invention in view of resistance to resolution at low temperature, transition temperature, electric reliability, birefringence, and another property.

In particular, the compound represented by General Formula (XV′-1), which is used in the liquid crystal composition of the present invention, is preferably at least one compound selected from the group consisting of compounds represented by Formulae (60.11) to (60.14), and more preferably the compound represented by Formula (60.12).

The liquid crystal composition of the present invention is preferably free from a compound having a molecular structure in which oxygen atoms are bonded to each other, such as the structure of a peroxy acid (—CO—OO—).

In terms of the reliability and long-term stability of the liquid crystal composition, the amount of a compound having a carbonyl group is preferably not more than 5 mass %, more preferably not more than 3 mass %, and further preferably not more than 1 mass % relative to the total mass of the composition. It is most preferred that the composition be substantially free from such a compound.

In terms of stability to irradiation with UV, the amount of a compound substituted with a chlorine atom is preferably not more than 15 mass %, more preferably not more than 10 mass %, and further preferably not more than 5 mass % relative to the total mass of the composition. It is most preferred that the composition be substantially free from such a compound.

The amount of compounds having molecules in which all of the ring structures are six-membered rings is preferably adjusted to be large. The amount of such compounds having molecules in which all of the ring structures are six-membered rings is preferably not less than 80 mass %, more preferably not less than 90 mass %, and further preferably not less than 95 mass % relative to the total mass of the composition. It is most preferred that the liquid crystal composition be substantially composed of only the compounds having molecules in which all of the ring structures are six-membered rings.

In order to suppress degradation of the liquid crystal composition due to oxidation thereof, the amount of a compound having a cyclohexenylene group that is a ring structure is preferably reduced. The amount of a compound having a cyclohexenylene group is preferably not more than 10 mass %, and more preferably not more than 5 mass % relative to the total mass of the composition. It is further preferred that the liquid crystal composition be substantially free from such a compound.

In terms of improvements in viscosity and Tni, the amount of a compound of which the molecules each contain a 2-methylbenzene-1,4-diyl group in which a hydrogen atom is optionally substituted with a halogen is preferably reduced. The amount of the compound of which the molecules each contain such a 2-methylbenzene-1,4-diyl group is preferably not more than 10 mass %, and more preferably not more than 5 mass % relative to the total mass of the composition. It is further preferred that the composition be substantially free from such a compound.

In the case where a compound contained in the composition of the first embodiment of the present invention has a side chain that is an alkenyl group, the alkenyl group preferably has 2 to 5 carbon atoms if the alkenyl group is bonded to cyclohexane, or the alkenyl group preferably has 4 or 5 carbon atoms if the alkenyl group is bonded to benzene. The unsaturated bond of the alkenyl group is preferably not directly connected to the benzene.

The liquid crystal composition of the present invention can contain a polymerizable compound to produce a liquid crystal display device of a PS mode, PSA mode involving use of a horizontal electric field, or PSVA mode involving use of a horizontal electric field. Examples of usable polymerizable compound include photopolymerizable monomers which are polymerized by being irradiated with energy rays such as light; in particular, examples of the polymerizable compound include polymerizable compounds having a structure with a liquid crystal molecular framework in which six-membered rings are bonded to each other, such as biphenyl derivatives and terphenyl derivatives. Specifically, the polymerizable compound is preferably a difunctional monomer represented by General Formula (XX).

In General Formula (XX), X²⁰¹ and X²⁰² each independently represent a hydrogen atom or a methyl group;

Sp²⁰¹ and Sp²⁰² each independently represent a single bond, an alkylene group having 1 to 8 carbon atoms, or —O—(CH₂)_(s)— (where s represents an integer from 2 to 7, and the oxygen atom is bonded to an aromatic ring);

Z²⁰¹ represents —OCH₂—, —CH₂O—, —COO—, —OCO—, —CF₂O—, —OCF₂—, —CH₂CH₂—, —CF₂CF₂—, —CH═CH—OCO—, —CH═CH—OCO—, —OCO—CH═CH—, —OCO—CH═CH—, —COO—CH₂CH₂—, —OCO—CH₂CH₂—, —CH₂CH₂—OCO—, —CH₂CH₂—OCO—, —COO—CH₂—, —OCO—CH₂—, —CH₂—COO—, —CH₂—OCO—, —CY¹═CY²— (where Y¹ and Y² each independently represent a fluorine atom or a hydrogen atom), —C≡C—, or a single bond; and

M²⁰¹ represents a 1,4-phenylene group, a trans-1,4-cyclohexylene group, or a single bond, and in each 1,4-phenylene group in the formula, any hydrogen atom is optionally substituted with a fluorine atom.

Diacrylate derivatives in which X²⁰¹ and X²⁰² each represent a hydrogen atom and dimethacrylate derivatives in which X²⁰¹ and X²⁰² are each a methyl group are preferred, and compounds in which one of X²⁰¹ and X²⁰² represents a hydrogen atom and in which the other one thereof represents a methyl group are also preferred. Among these compounds, the rate of polymerization is the highest in diacrylate derivatives and the lowest in dimethacrylate derivatives, and the rate of polymerization of unsymmetrical compounds is intermediate therebetween. Hence, an appropriate compound can be employed on the basis of the intended application. In PSA display devices, dimethacrylate derivatives are especially preferred.

Sp²⁰¹ and Sp²⁰² each independently represent a single bond, an alkylene group having 1 to 8 carbon atoms, or —O—(CH₂)_(s)—; in an application to PSA display devices, at least one of Sp²⁰¹ and Sp²⁰² is preferably a single bond, and compounds in which Sp²⁰¹ and Sp²⁰² each represent a single bond and compounds in which one of Sp²⁰¹ and Sp²⁰² is a single bond and in which the other one thereof represents an alkylene group having 1 to 8 carbon atoms or —O—(CH₂)_(s)— are preferred. In this case, an alkyl group having 1 to 4 carbon atoms is preferably employed, and s preferably ranges from 1 to 4.

Z²⁰¹ is preferably —OCH₂—, —CH₂O—, —COO—, —OCO—, —CF₂O—, —OCF₂—, —CH₂CH₂—, —CF₂CF₂—, or a single bond; more preferably —COO—, —OCO—, or a single bond; and especially preferably a single bond.

M²⁰¹ represents a 1,4-phenylene group in which any hydrogen atom is optionally substituted with a fluorine atom, a trans-1,4-cyclohexylene group, or a single bond; and a 1,4-phenylene group and a single bond are preferred. In the case where M²⁰¹ does not represent a single bond but represents a ring structure, Z²⁰¹ preferably does not represent a single bond but represents a linking group; in the case where M²⁰¹ represents a single bond, Z²⁰¹ is preferably a single bond.

From these viewpoints, a preferred ring structure between Sp²⁰¹ and Sp²⁰² in General Formula (XX) is particularly as follows.

In General Formula (XX), in the case where M²⁰¹ represents a single bond and where the ring structure consists of two rings, the ring structure is preferably represented by any of Formulae (XXa-1) to (XXa-5), more preferably Formulae (XXa-1) to (XXa-3), and especially preferably Formula (XXa-1).

In Formulae (XXa-1) to (XXa-5), the two ends of each structure are connected to Sp²⁰¹ or Sp²⁰², respectively.

Polymerizable compounds having such skeletons enable uneven display to be reduced or eliminated in PSA liquid crystal display devices because such polymerizable compounds have optimum alignment regulating force after being polymerized and thus produce a good alignment state.

Accordingly, the polymerizable monomer is preferably at least one compound selected from the group consisting of compounds represented by General Formulae (XX-1) to (XX-4), and more preferably the compound represented by General Formula (XX-2).

In General Formulae (XX-3) and (XX-4), Sp²⁰ represents an alkylene group having 2 to 5 carbon atoms.

In the case where the monomer is added to the liquid crystal composition of the present invention, polymerization is carried out even without a polymerization initiator; however, a polymerization initiator may be used to promote the polymerization. Examples of the polymerization initiator include benzoin ethers, benzophenones, acetophenones, benzyl ketals, and acyl phosphine oxides.

The liquid crystal composition of the present invention can further contain a compound which is represented by General Formula (Q) and which serves as an antioxidant.

In General Formula (Q), R^(Q) represents a linear or branched alkyl group having 1 to 22 carbon atoms; at least one CH₂ moiety contained in the alkyl group is optionally substituted with —O—, —CH═CH—, —CO—, —OCO—, —COO—, —C≡C—, —CF₂O—, or —OCF₂— such that oxygen atoms do not adjoin each other; and M^(Q) represents a trans-1,4-cyclohexylene group, a 1,4-phenylene group, or a single bond.

R^(Q) represents a linear or branched alkyl group having 1 to 22 carbon atoms, and at least one CH₂ moiety contained in the alkyl group is optionally substituted with —O—, —CH═CH—, —CO—, —OCO—, —COO—, —C≡C—, —CF₂O—, or —OCF₂— such that oxygen atoms do not adjoin each other. R^(Q) is preferably a linear alkyl group, a linear alkoxy group, a linear alkyl group of which one CH₂ moiety is substituted with —OCO— or —COO—, a branched alkyl group, a branched alkoxy group, or a branched alkyl group of which one CH₂ moiety is substituted with —OCO— or —COO—, each group having 1 to 20 carbon atoms; and more preferably a linear alkyl group, a linear alkyl group of which one CH₂ moiety is substituted with —OCO— or —COO—, a branched alkyl group, a branched alkoxy group, or a branched alkyl group of which one CH₂ moiety is substituted with —OCO— or —COO—, each group having 1 to 10 carbon atoms.

M^(Q) represents a trans-1,4-cyclohexylene group, a 1,4-phenylene group, or a single bond and is preferably a trans-1,4-cyclohexylene group or a 1,4-phenylene group.

The compound represented by General Formula (Q) is preferably at least one compound selected from the group consisting of compounds represented by General Formulae (Q-a) to (Q-d), and more preferably the compound represented by General Formula (Q-a) and/or the compound represented by General Formula (Q-c).

In these formulae, R^(Q1) is preferably a linear or branched alkyl group having 1 to 10 carbon atoms, R^(Q2) is preferably a linear or branched alkyl group having 1 to 20 carbon atoms, R^(Q3) is preferably a linear or branched alkyl or alkoxy group having 1 to 8 carbon atoms, and L^(Q) is preferably a linear or branched alkylene group having 1 to 8 carbon atoms. In particular, the compound represented by General Formula (Q) is preferably a compound represented by Formula (Q-a-1) and/or a compound represented by Formula (Q-c-1).

The liquid crystal composition of the present invention preferably contains one of the compounds represented by General Formula (Q), also preferably two of the compounds, and also preferably one to five of the compounds; the amount thereof is preferably in the range of 0.001 to 1 mass %, also preferably 0.001 to 0.1 mass %, and also preferably 0.001 to 0.05 mass % relative to the total mass of the liquid crystal composition of the present invention.

In the case where the liquid crystal composition of the present invention contains at least two compounds represented by General Formula (i) as well as the compound represented by Formula (11.2), the total amount of the compounds represented by General Formula (i), compound represented by Formula (ii), and compound represented by Formula (11.2) is preferably in the range of 12 to 56 mass %, more preferably 15 to 53 mass %, and further preferably 18 to 50 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains at least two compounds represented by General Formula (i) as well as the compound represented by Formula (31.4), the total amount of the compounds represented by General Formula (i), compound represented by Formula (ii), and compound represented by Formula (31.4) is preferably in the range of 10 to 35 mass %, more preferably 13 to 33 mass %, and further preferably 16 to 30 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains at least two compounds represented by General Formula (i) as well as the compound represented by Formula (44.1) and/or the compound represented by Formula (44.2), the total amount of the compounds represented by General Formula (i), compound represented by Formula (ii), compound represented by Formula (44.1), and compound represented by Formula (44.2) is preferably in the range of 18 to 45 mass %, more preferably 20 to 42 mass %, and further preferably 22 to 40 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains at least three compounds represented by General Formula (i) as well as the compound represented by Formula (6.6), the total amount of the compounds represented by General Formula (i), compound represented by Formula (ii), and compound represented by Formula (6.6) is preferably in the range of 20 to 45 mass %, more preferably 25 to 40 mass %, and further preferably 29 to 36 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i) as well as the compound represented by Formula (5.2), the total amount of the compound represented by General Formula (i), compound represented by Formula (ii), and compound represented by Formula (5.2) is preferably in the range of 20 to 45 mass %, more preferably 25 to 40 mass %, and further preferably 28 to 35 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i) as well as both the compound represented by Formula (2.3) and the compound represented by Formula (5.3), the total amount of the compound represented by General Formula (i), compound represented by Formula (ii), and compounds represented by Formulae (2.3) and (5.3) is preferably in the range of 25 to 40 mass %, more preferably 27 to 38 mass %, and further preferably 30 to 35 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i) as well as the compound represented by Formula (6.3), the total amount of the compound represented by General Formula (i), compound represented by Formula (ii), and compound represented by Formula (6.3) is preferably in the range of 17 to 33 mass %, more preferably 20 to 30 mass %, and further preferably 22 to 26 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i) as well as the compound represented by Formula (10.1), the total amount of the compound represented by General Formula (i), compound represented by Formula (ii), and compound represented by Formula (10.1) is preferably in the range of 20 to 35 mass %, more preferably 22 to 32 mass %, and further preferably 24 to 29 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i) as well as the compound represented by Formula (28.5), the total amount of the compound represented by General Formula (i), compound represented by Formula (ii), and compound represented by Formula (28.5) is preferably in the range of 8 to 25 mass %, more preferably 10 to 20 mass %, and further preferably 12 to 17 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i) as well as the compound represented by Formula (31.2), the total amount of the compound represented by General Formula (i), compound represented by Formula (ii), and compound represented by Formula (31.2) is preferably in the range of 20 to 35 mass %, more preferably 23 to 33 mass %, and further preferably 25 to 30 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i) as well as the compound represented by Formula (38.2), the total amount of the compound represented by General Formula (i), compound represented by Formula (ii), and compound represented by Formula (38.2) is preferably in the range of 20 to 35 mass %, more preferably 22 to 33 mass %, and further preferably 24 to 30 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i) as well as the compound represented by Formula (39.2), the total amount of the compound represented by General Formula (i), compound represented by Formula (ii), and compound represented by Formula (39.2) is preferably in the range of 10 to 33 mass %, more preferably 12 to 30 mass %, and further preferably 14 to 28 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i) as well as the compound represented by Formula (42.3), the total amount of the compound represented by General Formula (i), compound represented by Formula (ii), and compound represented by Formula (42.3) is preferably in the range of 5 to 20 mass %, more preferably 7 to 17 mass %, and further preferably 9 to 14 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i) as well as the compound represented by Formula (54.1), the compound represented by Formula (54.2), and/or the compound represented by Formula (54.4), the total amount of the compound represented by General Formula (i), compound represented by Formula (ii), and compounds represented by Formulae (54.1), (54.2), and (54.4) is preferably in the range of 15 to 35 mass %, more preferably 17 to 30 mass %, and further preferably 20 to 28 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i), the total amount of the compound represented by General Formula (i) and compound represented by Formula (ii) is preferably in the range of 5 to 25 mass %, more preferably 7 to 23 mass %, and further preferably 9 to 21 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i), the total amount of the compound represented by General Formula (i), compound represented by Formula (ii), and compounds represented by General Formulae (I-2), (I-5), (IV-2), and (X-3-1) is preferably in the range of 23 to 37 mass %, more preferably 25 to 35 mass %, and further preferably 28 to 32 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i), the total amount of the compound represented by General Formula (i), compound represented by Formula (ii), and compounds represented by General Formulae (III), (IV-4), and (XIV-2-2) is preferably in the range of 30 to 45 mass %, more preferably 33 to 42 mass %, and further preferably 35 to 40 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i), the total amount of the compound represented by General Formula (i), compound represented by Formula (ii), and compounds represented by General Formulae (III), (IV-4), (X-2-1), and (X-4-1) is preferably in the range of 25 to 38 mass %, more preferably 27 to 35 mass %, and further preferably 29 to 33 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i), the total amount of the compound represented by General Formula (i), compound represented by Formula (ii), and compound represented by General Formula (II-2) is preferably in the range of 20 to 33 mass %, more preferably 22 to 30 mass %, and further preferably 24 to 28 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i), the total amount of the compound represented by General Formula (i), compound represented by Formula (ii), and compounds represented by General Formulae (I-4), (II-2), (IV-4), and (X-2-1) is preferably in the range of 48 to 60 mass %, more preferably 50 to 58 mass %, and further preferably 52 to 56 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i), the total amount of the compound represented by General Formula (i), compound represented by Formula (ii), and compound represented by General Formula (IV-4) is preferably in the range of 15 to 30 mass %, more preferably 18 to 27 mass %, and further preferably 20 to 24 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i), the total amount of the compound represented by General Formula (i), compound represented by Formula (ii), and compounds represented by General Formulae (I-4), (IV-4), and (X-2-1) is preferably in the range of 40 to 53 mass %, more preferably 42 to 50 mass %, and further preferably 44 to 48 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i), the total amount of the compound represented by General Formula (i), compound represented by Formula (ii), and compounds represented by General Formulae (X-1-3) and (X-2-1) is preferably in the range of 25 to 40 mass %, more preferably 27 to 38 mass %, and further preferably 30 to 35 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i), the total amount of the compound represented by General Formula (i), compound represented by Formula (ii), and compounds represented by General Formulae (I-4), (II-2), and (XIV-1) is preferably in the range of 20 to 33 mass %, more preferably 22 to 30 mass %, and further preferably 24 to 28 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i), the total amount of the compound represented by General Formula (i), compound represented by Formula (ii), and compounds represented by General Formulae (IX-1-1), (X-3-1), and (XIV-2-2) is preferably in the range of 25 to 40 mass %, more preferably 28 to 37 mass %, and further preferably 30 to 35 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains one compound represented by General Formula (i), the total amount of the compound represented by General Formula (i), compound represented by Formula (ii), and compound represented by General Formula (IV-2) is preferably in the range of 13 to 25 mass %, more preferably 15 to 23 mass %, and further preferably 17 to 21 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains two compounds represented by General Formula (i), the total amount of the compounds represented by General Formula (i) and compound represented by Formula (ii) is preferably in the range of 11 to 32 mass %, more preferably 13 to 30 mass %, and further preferably 15 to 28 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains two compounds represented by General Formula (i), the total amount of the compounds represented by General Formula (i), compound represented by Formula (ii), and compounds represented by General Formulae (II-2), (X-1), and (X-6) is preferably in the range of 40 to 53 mass %, more preferably 42 to 50 mass %, and further preferably 44 to 48 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains two compounds represented by General Formula (i), the total amount of the compounds represented by General Formula (i), compound represented by Formula (ii), and compounds represented by General Formulae (I-1-2), (II-2), (IV-2), and (X-6) is preferably in the range of 83 to 95 mass %, more preferably 86 to 94 mass %, and further preferably 89 to 93 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains two compounds represented by General Formula (i), the total amount of the compounds represented by General Formula (i), compound represented by Formula (ii), and compounds represented by General Formulae (I-1-2), (II-2), (IV-2), (IX-2-2), and (X-6) is preferably in the range of 83 to 95 mass %, more preferably 86 to 94 mass %, and further preferably 89 to 93 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains three compounds represented by General Formula (i), the total amount of the compounds represented by General Formula (i) and compound represented by Formula (ii) is preferably in the range of 15 to 40 mass %, more preferably 18 to 38 mass %, and further preferably 20 to 36 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains three compounds represented by General Formula (i), the total amount of the compounds represented by General Formula (i), compound represented by Formula (ii), and compounds represented by General Formulae (VIII-1), (I-1-2), and (II-2) is preferably in the range of 75 to 92 mass %, more preferably 78 to 91 mass %, and further preferably 81 to 90 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains three compounds represented by General Formula (i), the total amount of the compounds represented by General Formula (i), compound represented by Formula (ii), and compounds represented by General Formulae (VIII-1), (I-1-2), (II-2), and (I-7) is preferably in the range of 75 to 90 mass %, more preferably 78 to 87 mass %, and further preferably 80 to 85 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains three compounds represented by General Formula (i), the total amount of the compounds represented by General Formula (i), compound represented by Formula (ii), and compounds represented by General Formulae (VIII-1), (I-1-2), (II-2), (IX-2-2), and (X-6) is preferably in the range of 85 to 98 mass %, more preferably 87 to 96 mass %, and further preferably 89 to 94 mass % relative to the total mass of the liquid crystal composition.

In the case where the liquid crystal composition of the present invention contains three compounds represented by General Formula (i), the total amount of the compounds represented by General Formula (i), compound represented by Formula (ii), and compounds represented by General Formulae (VIII-1), (I-1-2), (II-2), (I-5), (IV-1), and (V-2) is preferably in the range of 80 to 94 mass %, more preferably 83 to 92 mass %, and further preferably 85 to 90 mass % relative to the total mass of the liquid crystal composition.

<Liquid Crystal Display Device>

The liquid crystal composition of the present invention, to which a polymerizable compound has been added, is irradiated with ultraviolet to polymerize the polymerizable compound with the result that liquid crystal molecules can be aligned; thus, such a liquid crystal composition is used in liquid crystal display devices in which the birefringence of the liquid crystal composition is utilized to control the amount of light that is to be transmitted. Such a liquid crystal composition is useful in liquid crystal display devices, such as an ECB-LCD, a VA-LCD, a VA-IPS-LCD, an FFS-LCD, an AM-LCD (active matrix liquid crystal display device), a TN (nematic liquid crystal display device), an STN-LCD (super twisted nematic liquid crystal display device), an OCB-LCD, and an IPS-LCD (in-plane switching liquid crystal display device), particularly useful in an AM-LCD, and can be used in transmissive or reflective liquid crystal display devices.

Two substrates used in a liquid crystal cell included in a liquid crystal display device can be made of a transparent material having flexibility, such as glass or a plastic material, and one of these substrates may be made of a non-transparent material such as silicon. In order to form a transparent electrode layer on a transparent substrate such as a glass plate, for example, indium tin oxide (ITO) is sputtered on the transparent substrate.

Color filters can be produced by, for instance, a pigment dispersion technique, a printing technique, an electrodeposition technique, or a staining technique. In production of the color filters by, for example, a pigment dispersion technique, a curable colored composition for a color filter is applied onto the transparent substrate, patterned, and then cured by being heated or irradiated with light. This process is carried out for each of three colors of red, green, and blue, thereby being able to produce the pixels of the color filters. Active elements such as a TFT or a thin-film diode may be provided on the resulting substrate to form pixel electrodes.

The substrates are arranged so as to face each other with the transparent electrode layer interposed therebetween. In the arrangement of the substrates, a spacer may be disposed between the substrates to adjust the distance therebetween. In this case, the distance between the substrates is adjusted so that the thickness of a light modulating layer to be formed is preferably in the range of 1 to 100 μm, and more preferably 1.5 to 10 μm. In the case where a polarizing plate is used, the product of the refractive index anisotropy Δn of liquid crystal and a cell thickness d is preferably adjusted to achieve the maximum contrast. In the case where two polarizing plates are used, a polarization axis of each polarizing plate may be adjusted to give a good viewing angle or contrast. Furthermore, a retardation film may be also used to increase a viewing angle. Examples of the spacer include columnar spacers made of, for instance, glass particles, plastic particles, alumina particles, and photoresist materials. A sealing material such as a thermosetting epoxy composition is subsequently applied to the substrates by screen printing in a state in which a liquid crystal inlet has been formed, the substrates are attached to each other, and then the sealing material is heated to be thermally cured.

The polymerizable-compound-containing liquid crystal composition can be put into the space between the two substrates by a vacuum injection technique or ODF technique which is generally employed. A vacuum injection technique, however, has a problem in which traces of the injection remain while droplet stains do not remain. The present invention can be more suitably applied to display devices manufactured by an ODF technique. In a process for manufacturing a liquid crystal display device by an ODF technique, an optically and thermally curable epoxy-based sealing material is applied to any one of a backplane and a frontplane with a dispenser in the form of a closed loop that serves as a wall, a certain amount of the liquid crystal composition is dropped onto part of the substrate surrounded by the applied sealing material in a degassed atmosphere, and then the frontplane and the backplane are bonded to each other, thereby manufacturing a liquid crystal display device. The liquid crystal composition of the present invention can be stably dropped in an ODF process and can be therefore desirably used.

Since a proper polymerization rate is desired to enable liquid crystal molecules to be aligned in a good manner, the polymerizable compound is preferably polymerized by being irradiated with one of active energy rays, such as an ultraviolet ray and an electron beam, or by being irradiated with such active energy rays used in combination or in sequence. In the use of an ultraviolet ray, a polarized light source or a non-polarized light source may be used. In the case where the polymerizable-compound-containing liquid crystal composition is polymerized in a state in which the composition has been disposed between the two substrates, at least the substrate on the side from which active energy rays are emitted needs to have transparency suitable for the active energy rays. Another technique may be used, in which only the intended part is polymerized by being irradiated with light with a mask, the alignment state of the non-polymerized part is subsequently changed by adjusting conditions such as an electric field, a magnetic field, or temperature, and then polymerization is further carried out through irradiation with active energy rays. In particular, exposure to ultraviolet is preferably carried out while an alternating current electric field is applied to the polymerizable-compound-containing liquid crystal composition. The alternating current electric field to be applied preferably has a frequency ranging from 10 Hz to 10 kHz, and more preferably 60 Hz to 10 kHz; and the voltage is determined on the basis of a predetermined pretilt angle in a liquid crystal display device. In other words, the pretilt angle in a liquid crystal display device can be controlled by adjusting voltage to be applied. In MVA-mode liquid crystal display devices which involve use of a horizontal electric field, a pretilt angle is preferably controlled to be from 80 degrees to 89.9 degrees in view of alignment stability and contrast.

The temperature in the irradiation procedure is preferably within a temperature range in which the liquid crystal state of the liquid crystal composition of the present invention can be maintained. Polymerization is preferably carried out at a temperature close to room temperature, i.e., typically 15 to 35° C. Preferred examples of a lamp usable for emitting an ultraviolet ray include a metal halide lamp, a high-pressure mercury lamp, and an ultrahigh-pressure mercury lamp. In addition, an ultraviolet ray to be emitted preferably has a wavelength that is in a wavelength region different from the wavelength region of light absorbed by the liquid crystal composition; it is preferred that an ultraviolet ray in a particular wavelength range be cut off as needed. The intensity of an ultraviolet ray to be emitted is preferably from 0.1 mW/cm² to 100 W/cm², and more preferably 2 mW/cm² to 50 W/cm². The energy of an ultraviolet ray to be emitted can be appropriately adjusted: preferably from 10 mJ/cm² to 500 J/cm², and more preferably 100 mJ/cm² to 200 J/cm². The intensity may be changed in the exposure to ultraviolet. The time of the exposure to ultraviolet is appropriately determined on the basis of the intensity of the ultraviolet ray to be emitted: preferably from 10 seconds to 3600 seconds, and more preferably 10 seconds to 600 seconds.

Liquid crystal display devices using the liquid crystal composition of the present invention are practical because they quickly respond and are less likely to suffer from defective display at the same time; in particular, the liquid crystal composition is useful to active-matrix liquid crystal display devices and can be applied to liquid crystal display devices of a VA mode, PSVA mode, PSA mode, IPS (in-plane switching) mode, VA-IPS mode, FFS (fringe-field switching) mode, and ECB mode.

A liquid crystal display according to a preferred embodiment of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view illustrating a liquid crystal display device which includes two substrates facing each other, a sealing material disposed between the substrates, and liquid crystal confined in a sealed region surrounded by the sealing material.

In particular, FIG. 1 illustrates a specific embodiment of a liquid crystal display device which includes a backplane including a first substrate 100, TFT layers 102 and pixel electrodes 103 each formed so as to overlie the first substrate 100, and a passivation film 104 and first alignment film 105 each formed so as to cover these components; a frontplane placed so as to face the backplane and including a second substrate 200, a black matrix 202, color filters 203, planarization film (overcoat layer) 201, and transparent electrode 204 each formed so as to overlie the second substrate 200, and a second alignment film 205 formed so as to cover these components; a sealing material 301 disposed between the substrates; and a liquid crystal layer 303 confined in a sealed region surrounded by the sealing material. In addition, protrusions (columnar spacers) 302 and 304 are extending from a surface to which the sealing material 301 has been applied.

Any substantially transparent material can be used for the first substrate or the second substrate; for instance, glass, ceramic materials, and plastic materials can be used. Examples of materials used for the plastic substrate include cellulose derivatives such as cellulose, triacetyl cellulose, and diacetyl cellulose; polyesters such as polycycloolefin derivatives, polyethylene terephthalate, and polyethylene naphthalate; polyolefins such as polypropylene and polyethylene; polycarbonate; polyvinyl alcohol; polyvinyl chloride; polyvinylidene chloride; polyamide; polyimide; polyimideamide; polystyrene; polyacrylate; polymethyl methacrylate; polyethersulfone; polyarylate; and inorganic-organic composite materials such as glass fiber-epoxy resin and glass fiber-acrylic resin.

In the case where the plastic substrate is used, a barrier film is preferably formed. The barrier film serves to reduce the moisture permeability of the plastic substrate, which enhances the reliability of the electrical properties of the liquid crystal display device. Any barrier film having high transparency and low water vapor permeability can be used; in general, a thin film formed of an inorganic material, such as silicon oxide, by vapor deposition, sputtering, or a chemical vapor deposition method (CVD method) can be used.

In the present invention, the first and second substrates may be formed of materials the same as or different from each other without limitation. A glass substrate is preferably employed because using the glass substrate enables manufacturing of a liquid crystal display device exhibiting excellent thermal resistance and dimensional stability. A plastic substrate is also preferably employed because it is suitable for manufacturing by a roll-to-roll process and appropriately enables weight reduction and an enhancement in flexibility. In terms of imparting flatness and thermal resistance to the substrate, a combination of a plastic substrate and a glass substrate can give a good result.

In Examples which will be described later, a substrate is used as a material of the first substrate 100 or the second substrate 200.

In the backplane, the TFT layers 102 and the pixel electrodes 103 are disposed so as to overlie the first substrate 100. These components are formed through an arraying process which is generally used. The passivation film 104 and the first alignment film 105 are formed so as to cover these components, thereby completing the formation of the backplane.

The passivation film 104 (also referred to as an inorganic protective film) is a film used for protecting the TFT layers; in general, a nitride film (SiNx), an oxide film (SiOx), or another film is formed by, for example, a chemical vapor deposition (CVD) method.

The first alignment film 105 is a film which serves to align liquid crystal molecules; in general, a polymeric material, such as polyimide, is used in many cases. An alignment agent solution containing a polymeric material and a solvent is used as a coating liquid. The alignment film may reduce adhesion to the sealing material and is therefore applied in patterns in a sealed region. The alignment agent solution is applied by a printing technique, such as flexography, or a droplet ejection technique, such as an ink jet technique. The alignment agent solution which has been applied is temporarily dried to evaporate the solvent and then baked to be cross-linked and cured. Then, the cured product is subjected to an alignment treatment to develop an alignment function.

In general, a rubbing process is employed for the alignment treatment. The polymeric film produced as described above is unidirectionally rubbed with a rubbing cloth formed of a fibrous material such as rayon, which develops a function of aligning liquid crystal molecules.

A photo-alignment technique may be used. In the photo-alignment technique, an alignment function is developed by emitting polarized light onto an alignment film containing a photosensitive organic material, so that damage of a substrate and generation of dusts which are both caused by a rubbing process are eliminated. Examples of the organic materials used in the photo-alignment technique include materials containing dichroic dyes. A material usable as the dichroic dye has a group which induces an optical reaction resulting in development of a function of aligning liquid crystal molecules (hereinafter referred to as photo-alignment group): induction of molecular alignment or isomerization reaction (e.g., azobenzene group) caused by the Weigert effect based on photodichroism, a dimerization reaction (e.g., cinnamoyl group), a photo-cross-linking reaction (e.g., benzophenone group), or a photodegradation reaction (e.g., polyimide group). After the applied alignment agent solution is temporarily dried to evaporate the solvent, the product is irradiated with light having a predetermined polarization (polarized light), thereby being able to produce an alignment film which enables alignment in the intended direction.

In the frontplane, the black matrix 202, the color filters 203, the planarization film 201, the transparent electrode 204, and the second alignment film 205 are disposed so as to overlie the second substrate 200.

The black matrix 202 is formed by, for example, a pigment dispersion technique. In particular, a color resin liquid in which a black colorant has been uniformly dispersed for formation of the black matrix is applied onto the second substrate 200 on which the barrier film 201 has been formed, thereby forming a colored layer. The colored layer is subsequently cured by being baked. A photoresist is applied onto the cured layer and then pre-baked. The photoresist is exposed to light through a mask pattern, and then development is carried out to pattern the colored layer. Then, the photoresist layer is removed, and the colored layer is baked to complete the black matrix 202.

Alternatively, a photoresist-type pigment dispersion liquid may be used. In this case, the photoresist-type pigment dispersion liquid is applied, pre-baked, and exposed to light through a mask pattern; and then development is carried out to pattern the colored layer. Then, the photoresist layer is removed, and the colored layer is baked to complete the black matrix 202.

The color filters 203 are formed by a pigment dispersion technique, an electrodeposition technique, a printing technique, or a staining technique. In a pigment dispersion technique, for example, a color resin liquid in which a pigment (e.g., red) has been uniformly dispersed is applied onto the second substrate 200 and then cured by being baked, and a photoresist is applied onto the cured product and pre-baked. The photoresist is exposed to light through a mask pattern, and then development is carried out to form a pattern. The photoresist layer is subsequently removed, and baking is carried out again, thereby completing a (red) color filter 203. The color filters may be formed in any order of colors. A green color filter 203 and a blue color filter 203 are similarly formed.

The transparent electrode 204 is formed so as to overlie the color filters 203 (the overcoat layer (201) is optionally formed on the color filters 203 to flatten the surfaces). The transparent electrode 204 preferably has a high light transmittance and low electric resistance. In the formation of the transparent electrode 204, an oxide film of, for example, ITO is formed by sputtering.

In order to protect the transparent electrode 204, a passivation film is formed on the transparent electrode 204 in some cases.

The second alignment film 205 is the same as the above-mentioned first alignment film 105.

Although a specific embodiment of the backplane and frontplane used in the present invention has been described, the present invention is not limited to this specific embodiment and can be freely modified to provide a desired liquid crystal display device.

The columnar spacers may have any shape, and the horizontal section thereof may have any shape such as a circular, square, or polygonal shape; in particular, the horizontal section preferably has a circular shape or a regular polygonal shape in view of a margin for misalignment in the formation process. Furthermore, such protrusions preferably have the shape of a circular truncated cone or truncated pyramid.

Any material which is insoluble in the sealing material, an organic solvent used in the sealing material, and the liquid crystal can be used for the columnar spacers; a synthetic resin (curable resin) is preferably employed in terms of processability and weight reduction. The protrusions can be formed above the surface of the first substrate by photolithography or a droplet ejection technique, the surface being subjected to application of the sealing material. For such a reason, a photocurable resin suitable for photolithography and a droplet ejection technique is preferably employed.

An illustrative case in which the columnar spacers are formed by photolithography will now be described. FIG. 2 illustrates an exposure process in which a pattern for forming the columnar spacers above the black matrix is employed as the pattern of a photomask.

A resin solution (not containing a colorant) used for forming the columnar spacers is applied onto the transparent electrode 204 of the frontplane. Then, the resulting resin layer 402 is cured by being baked. A photoresist is applied onto the cured layer and then pre-baked. The photoresist is exposed to light through a mask pattern 401, and then development is carried out to pattern the resin layer. The photo resist layer is subsequently removed, and then the resin layer is baked to complete the columnar spacers (corresponding to 302 and 304 in FIG. 1).

Positions at which the columnar spacers are to be formed can be appropriately determined on the basis of the mask pattern. Accordingly, both the inside of the sealed region and the outside thereof (part to which the sealing material is to be applied) can be simultaneously formed in the liquid crystal display device. The columnar spacers are preferably formed above the black matrix to avoid degrading the quality of the sealed region. The columnar spacers formed by photolithography as described above are also referred to as column spacers or photo spacers.

The material used for forming the spacers is a mixture containing, for example, a negative water-soluble resin, such as a PVA-stilbazo photosensitive resin; a polyfunctional acrylic monomer; an acrylic acid copolymer; and a triazole-based initiator. In another technique, a color rein in which a colorant has been dispersed in a polyimide resin is used. In the present invention, any technique can be employed, and existing materials suitable for liquid crystal and sealing material, which are to be used, can be used to form the spacers.

After the columnar spacers are formed on part of the surface of the frontplane, which serves as the sealed region, in this manner, the sealing material (corresponding to 301 in FIG. 1) is applied to the intended part of the surface of the backplane.

Any material can be used as the sealing material, and a curable resin composition prepared by adding a polymerization initiator to an epoxy-based or acrylic photocurable resin, a thermosetting resin, or an optically and thermally curable resin is used. Fillers containing inorganic or organic materials are added in some cases to adjust moisture permeability, an elastic modulus, viscosity, and another property. Such fillers may have any shape such as a spherical shape, a fibrous shape, or an amorphous shape. Furthermore, a spherical or fibrous gap material having a single dispersion diameter may be mixed to properly control the cell gap, and a fibrous material which can be easily wound around the protrusions formed above the substrate may be mixed to enhance the adhesion to the plates. The diameter of the fibrous material used in this case is desirably from approximately ⅕ to 1/10 of the cell gap, and the length of the fibrous material is desirably shorter than the width of an applied sealing material.

Any substance can be used as the fibrous material provided that the fibrous material can have a predetermined shape; synthetic fibers, such as cellulose, polyamide, and polyester, and inorganic materials, such as glass and carbon, can be appropriately selected.

The sealing material can be applied by a printing technique or a dispensing technique, and a dispensing technique is desirably employed because the amount of the sealing material to be used in the dispensing technique is small. In general, the sealing material is applied to a position corresponding to the position of the black matrix to avoid adversely affecting the sealed region. In order to form a liquid crystal-dropped region used in the subsequent process (to prevent the liquid crystal from leaking), the sealing material is applied in the form of a closed loop.

Liquid crystal is dropped to the closed-loop structure (sealed region) of the frontplane, the closed-loop structure having been formed by application of the sealing material. In general, a dispenser is used. Since the amount of liquid crystal to be dropped should be equivalent to the capacity of a liquid crystal cell, the amount is basically equal to the volume that is the product of the height of the columnar spacers and the area surrounded by the sealing material. In order to reduce the leakage of liquid crystal in a cell bonding process or to optimize displaying characteristics, the amount of the liquid crystal to be dropped may be appropriately adjusted, or positions to which the liquid crystal are dropped may be dispersed.

Then, the backplane is bonded to the frontplane to which the sealing material has been applied and liquid crystal has been dropped. In particular, the frontplane and the backplane are attached to stages having a mechanism for holding the substrates, such as an electrostatic chuck, and then the frontplane and the backplane are disposed at a position (in a distance) which enables the second alignment film of the frontplane to face the first alignment film of the backplane and which enables the sealing material not to contact the other side. In this state, pressure in the system is reduced. After the reduction in pressure, the positions of the frontplane and backplane are adjusted (alignment process) while parts of the frontplane and backplane which are to be bonded to each other are confirmed. After the adjustment of the positions, the frontplane and the backplane are moved to bring the sealing material on the frontplane into contact with the backplane. In this state, the inside of the system is filled with inert gas, and the vacuum is gradually released into normal pressure. In this process, atmospheric pressure enables the frontplane and the backplane to be bonded to each other, and the height of the columnar spacers defines a cell gap. In this state, the sealing material is irradiated with ultraviolet light to cure the sealing material, thereby forming the liquid crystal cell. Then, a heating process is optionally carried out to promote the curing of the sealing material. The heating process is carried out in many cases to enhance the adhesion of the sealing material and the reliability of electrical properties.

EXAMPLES

Although the present invention will now be described further in detail with reference to Examples, the present invention is not limited to Examples. In compositions which will be described in Examples and Comparative Examples, the term “%” refers to “mass %”.

In Examples, the following properties were measured.

Tni: Nematic phase-isotropic liquid phase transition temperature (° C.)

Δn: Refractive index anisotropy at 298 K (also referred to as birefringence)

Δ∈: Dielectric anisotropy at 298 K

η: Viscosity at 293 K (mPa·s)

γ1: Rotational viscosity at 298 K (mPa·s)

VHR: Voltage holding ratio (%) at 333 K under the conditions including a frequency of 60 Hz and an applied voltage of 5 V

VHR after Thermal Test: a TEG (test element group) in which a sample of a liquid crystal composition had been confined and which was used for evaluating electrooptical properties was held in a constant bath at 130° C. for an hour, and then the measurement was carried out under the same conditions as the above-mentioned measurement of VHR.

Screen Burn-in:

In order to evaluate screen burn-in in a liquid crystal display device, a certain fixed pattern was continuously displayed in a display area for a predetermined test time, and then an image was displayed evenly on the whole of the screen. In this procedure, test time taken for the afterimage of the fixed pattern to reach an unacceptable level was measured.

(1) The term “test time” herein refers to time over which the fixed pattern was displayed. The longer the test time in result of the measurement was, the more the occurrence of the after image was reduced; the long test time shows that the liquid crystal display device had a high performance. (2) The unacceptable level of the after image refers to a level at which the degree of the observed after image was determined as being unacceptable in judgment of acceptance.

Droplet Stains:

In order to evaluate droplet stains in a liquid crystal display, white droplet stains which emerged in an entirely-black display mode were visually observed. Result of the observation was evaluated on the basis of the following five criteria.

5: No droplet stain observed (excellent)

4: Slight droplet stains observed, but acceptable (good)

3: Some droplet stains observed, the borderline in judgment of acceptance (acceptable with some conditions)

2: Afterimage observed, unacceptable (bad)

1: Afterimage observed, quite inadequate (poor)

Process Adaptability:

In an ODF process, 50 pL of liquid crystal was dropped 100 times with a constant volume metering pump, and this 100-times dropping was repeated such as “0 to 100, 101 to 200, 201 to 300 . . . ”. The mass of the liquid crystal dropped 100 times was measured in each cycle to obtain the number of times of the dropping at which a variation in mass reached the degree that was unsuitable for the ODF process. Process adaptability was evaluated on the basis of this obtained number of times of the dropping.

The larger the obtained number of times of the dropping was, the more liquid crystal was able to be stably dropped for a long time; the larger number of times of the dropping shows that the liquid crystal had high process adaptability.

Resistance to Resolution at Low Temperature:

In order to evaluate resistance to resolution at low temperature, a liquid crystal composition was prepared and then weighted to 1 g in a 2-mL sample bottle, and the sample bottle was subjected to a continuous temperature change in a temperature controlled chamber in a cycle of the following operation: −20° C. (retained for an hour)→heating (0.1° C./min)→0° C. (retained for an hour)→heating (0.1° C./min)→20° C. (retained for an hour)→cooling (−0.1° C./min)→0° C. (retained for an hour)→cooling (−0.1° C./min)→−20° C. Then, precipitate generated in the liquid crystal composition was visually observed, and the test time at which the precipitate had been observed was measured.

The longer the test time was, the more the liquid crystal phase was stably maintained for a long time; the longer test time shows that the liquid crystal composition had a good resistance to resolution at low temperature.

Volatility/Contamination of Manufacturing Equipment:

In order to evaluate the volatility of a liquid crystal material, operation of a vacuum defoaming mixer was observed with a stroboscope for visual surveillance of foaming of the liquid crystal material. In particular, 0.8 kg of a liquid crystal composition was put into the 2.0-L container dedicated to the vacuum defoaming mixer, the vacuum defoaming mixer was operated under a vacuum of 4 kPa at an orbital speed of 15 S⁻¹ and a rotating velocity of 7.5 S⁻¹, and the time taken for the liquid crystal composition to start foaming was measured.

The longer the time taken for the liquid crystal composition to start foaming was, the less the liquid crystal composition was volatilized. Since a less volatile liquid crystal composition hardly contaminates manufacturing equipment, a longer time taken for the liquid crystal composition to start foaming shows that the liquid crystal composition had a highly quality.

Examples 1 and 2

Compositions were prepared as shown in Table 1, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 2 shows results of the evaluations of the compositions and liquid crystal displays.

Comparative Example 1

A composition free from the compound represented by Formula (ii) was prepared as shown in Table 1, and an IPS liquid crystal display having the structure illustrated in FIGS. 1 and 2 was produced. Table 2 shows results of the evaluations of the composition and liquid crystal display.

TABLE 1 Ratio (Mass %) Formula of Comparative Exam- Exam- Compound Example 1 ple 1 ple 2 Formula (i.2) 5 5 5 Formula (i.4) 5 5 5 Formula (ii) 10 20 Formula (2.2) 30 25 20 Formula (2.4) 5 Formula (11.1) 10 10 5 Formula (15.1) 5 5 5 Formula (18.1) 5 5 5 Formula (18.6) 5 5 5 Formula (19.11) 5 5 5 Formula (30.1) 5 5 5 Formula (30.2) 5 5 5 Formula (30.4) 5 5 5 Formula (44.32) 10 10 10

TABLE 2 Result of Evaluation Comparative Exam- Exam- Evaluation Item Example 1 ple 1 ple 2 T_(NI)/° C. 94.2 97.1 95.8 Δn 0.132 0.134 0.133 Δε 5.2 5.3 5.3 η/mPa · s 19 19 18 γ₁/mPa · s 88 88 88 Initial Voltage 98.9 99.2 99.6 Holding Ratio (%) Voltage Holding 97.9 98.8 99.1 Ratio after Thermal Test (%) Screen Burn-in 150 300 600 (h) Droplet Stains 2 5 5 Contamination of 45 80 180 Manufacturing Equipment (s) Process 100 400 1010 Adaptability (100 Times) Resistance to 110 600 575 Resolution at Low Temperature (h)

As compared with the composition prepared in Comparative Example 1, the compositions prepared in Examples 1 and 2 were able to be stably and continuously dropped for a long time in an ODF process and had a very excellent resistance to resolution at low temperature. Screen burn-in was more reduced in the liquid crystal displays produced in Examples 1 and 2 than in the liquid crystal display produced in Comparative Example 1.

Examples 3 and 4

Compositions were prepared as shown in Table 3, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 4 shows results of the evaluations of the compositions and liquid crystal displays.

Comparative Example 2

A composition free from the compound represented by General Formula (i) was prepared as shown in Table 3, and an IPS liquid crystal display having the structure illustrated in FIGS. 1 and 2 was produced. Table 4 shows results of the evaluations of the composition and liquid crystal display.

TABLE 3 Ratio (Mass %) Formula of Comparative Exam- Exam- Compound Example 2 ple 3 ple 4 Formula (i.2) 2 3 Formula (i.3) 3 3 Formula (i.4) 3 Formula (ii) 11 11 11 Formula (2.2) 24 26 28 Formula (5.4) 6 6 6 Formula (11.1) 12 12 12 Formula (11.2) 14 12 10 Formula (26.1) 9 9 9 Formula (26.2) 10 10 10 Formula (37.2) 7 5 5 Formula (49.2) 7 4

TABLE 4 Result of Evaluation Comparative Exam- Exam- Evaluation Item Example 2 ple 3 ple 4 T_(NI)/° C. 79.5 77.6 79.8 Δn 0.109 0.109 0.109 Δε 7.0 7.5 7.6 η/mPa · s 17 17 18 γ₁/mPa · s 68 66 63 Initial Voltage 98.6 99.4 99.6 Holding Ratio (%) Voltage Holding 96.4 98.4 98.9 Ratio after Thermal Test (%) Screen Burn-in 55 470 610 (h) Droplet Stains 1 5 5 Contamination of 100 160 200 Manufacturing Equipment (s) Process 175 800 1210 Adaptability (100 Times) Resistance to 240 500 575 Resolution at Low Temperature (h)

Examples 5 to 7

Compositions were prepared as shown in Table 5, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 6 shows results of the evaluations of the compositions and liquid crystal displays.

Comparative Example 3

A composition free from the compound represented by Formula (ii) was prepared as shown in Table 5, and an IPS liquid crystal display having the structure illustrated in FIGS. 1 and 2 was produced. Table 6 shows results of the evaluations of the composition and liquid crystal display.

TABLE 5 Ratio (Mass %) Formula of Exam- Exam- Exam- Comparative Compound ple 5 ple 6 ple 7 Example 3 Formula (i.2) 2 4 6 6 Formula (i.3) 7 6 5 5 Formula (i.4) 7 6 5 5 Formula (ii) 14 8 10 Formula (2.2) 38 35 40 50 Formula (11.2) 9 10 Formula (15.1) 4 6 12 Formula (18.6) 4 5 Formula (26.2) 8 7 6 6 Formula (28.3) 15 16 11 11 Formula (28.5) 5 5

TABLE 6 Result of Evaluation Exam- Exam- Exam- Comparative Evaluation Item ple 5 ple 6 ple 7 Example 3 T_(NI)/° C. 81.1 87.4 80.4 80.8 Δn 0.099 0.110 0.109 0.105 Δε 8.0 8.2 7.6 7.5 η/mPa · s 13 16 14 12 γ₁/mPa · s 48 60 52 47 Initial Voltage 99.4 99.2 99.6 97.9 Holding Ratio (%) Voltage Holding 98.8 98.5 98.2 96.0 Ratio after Thermal Test (%) Screen Burn-in 700 650 600 110 (h) Droplet Stains 5 4 5 1 Contamination of 190 200 190 25 Manufacturing Equipment (s) Process 1050 1000 1000 60 Adaptability (100 Times) Resistance to 640 600 460 150 Resolution at Low Temperature (h)

Examples 8 to 11

Compositions were prepared as shown in Table 7, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 8 shows results of the evaluations of the compositions and liquid crystal displays.

TABLE 7 Ratio (Mass %) Formula of Exam- Exam- Exam- Exam- Compound ple 8 ple 9 ple 10 ple 11 Formula (i.2) 2 4 10 Formula (i.3) 8 5 8 4 Formula (i.4) 10 7 6 4 Formula (ii) 12 10 14 8 Formula (1.2) 12 16 Formula (2.2) 38 28 20 42 Formula (8.1) 1 1 1 1 Formula (11.1) 10 5 2 Formula (11.2) 10 5 8 Formula (26.2) 2 1 1 2 Formula (28.3) 8 9 11 10 Formula (44.2) 4 4 Formula (59.1) 5 5 5 5 Formula (61.1) 4 4 4 4

TABLE 8 Result of Evaluation Exam- Exam- Exam- Exam- Evaluation Item ple 8 ple 9 ple 10 ple 11 T_(NI)/° C. 87.5 88.7 92.2 84.8 Δn 0.109 0.106 0.105 0.103 Δε 11.4 10.5 10.1 11.3 η/mPa · s 17 14 14 14 γ₁/mPa · s 95 79 75 84 Initial Voltage 99.6 99.3 99.4 99.0 Holding Ratio (%) Voltage Holding 98.8 98.0 98.5 97.8 Ratio after Thermal Test (%) Screen Burn-in 620 450 500 450 (h) Droplet Stains 5 4 5 3 Contamination of 190 170 180 150 Manufacturing Equipment (s) Process 1000 850 980 750 Adaptability (100 Times) Resistance to 600 500 550 400 Resolution at Low Temperature (h)

Examples 12 to 15

Compositions were prepared as shown in Table 9, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 10 shows results of the evaluations of the compositions and liquid crystal displays.

TABLE 9 Ratio (Mass %) Formula of Exam- Exam- Exam- Exam- Compound ple 12 ple 13 ple 14 ple 15 Formula (i.2) 4 9 11 3 Formula (i.3) 8 6 4 9 Formula (i.4) 10 7 5 8 Formula (ii) 14 10 18 8 Formula (2.2) 32 22 18 15 Formula (2.3) 12 8 Formula (3.1) 23 Formula (11.1) 4 2 6 Formula (11.2) 12 10 8 6 Formula (15.1) 4 Formula (26.2) 2 2 2 2 Formula (28.3) 17 7 18 10 Formula (28.5) 10 2 7 Formula (44.2) 2 Formula (60.2) 1 1 1

TABLE 10 Result of Evaluation Exam- Exam- Exam- Exam- Evaluation Item ple 12 ple 13 ple 14 ple 15 T_(NI)/° C. 91.2 89.9 92.8 86.0 Δn 0.108 0.111 0.110 0.104 Δε 10.3 9.6 9.7 9.3 η/mPa · s 19 22 19 19 γ₁/mPa · s 98 102 102 95 Initial Voltage 99.6 99.2 99.3 99.5 Holding Ratio (%) Voltage Holding 98.6 98.0 98.2 98.6 Ratio after Thermal Test (%) Screen Burn-in 600 480 540 600 (h) Droplet Stains 5 3 4 5 Contamination of 190 150 170 190 Manufacturing Equipment (s) Process 1100 650 800 1010 Adaptability (100 Times) Resistance to 610 440 490 600 Resolution at Low Temperature (h)

Examples 16 to 19

Compositions were prepared as shown in Table 11, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 12 shows results of the evaluations of the compositions and liquid crystal displays.

TABLE 11 Ratio (Mass %) Formula of Exam- Exam- Exam- Exam- Compound ple 16 ple 17 ple 18 ple 19 Formula (i.2) 2 4 5 6 Formula (i.3) 8 5 9 2 Formula (i.4) 8 9 4 10 Formula (ii) 13 7 9 3 Formula (2.2) 37 40 33 47 Formula (9.2) 9 Formula (11.1) 5 5 9 Formula (11.2) 15 10 7 4 Formula (18.1) 3 2 Formula (20.2) 2 Formula (26.2) 7 7 9 6 Formula (28.3) 10 5 8 11 Formula (28.5) 5

TABLE 12 Result of Evaluation Exam- Exam- Exam- Exam- Evaluation Item ple 16 ple 17 ple 18 ple 19 T_(NI)/° C. 81.7 80.0 73.2 80.6 Δn 0.100 0.104 0.103 0.098 Δε 8.5 8.4 8.9 8.2 η/mPa · s 15 16 15 14 γ₁/mPa · s 77 77 73 71 Initial Voltage 99.6 99.5 99.4 99.5 Holding Ratio (%) Voltage Holding 98.4 98.0 98.0 98.4 Ratio after Thermal Test (%) Screen Burn-in 650 570 560 620 (h) Droplet Stains 5 4 4 5 Contamination of 200 170 165 190 Manufacturing Equipment (s) Process 1100 750 800 1120 Adaptability (100 Times) Resistance to 610 490 520 600 Resolution at Low Temperature (h)

Examples 20 to 23

Compositions were prepared as shown in Table 13, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 14 shows results of the evaluations of the compositions and liquid crystal displays.

TABLE 13 Ratio (Mass %) Formula of Exam- Exam- Exam- Exam- Compound ple 20 ple 21 ple 22 ple 23 Formula (i.2) 3 4 5 6 Formula (i.3) 7 6 4 2 Formula (i.4) 3 3 4 5 Formula (ii) 13 13 13 13 Formula (2.2) 36 30 25 25 Formula (9.2) 8 8 Formula (11.1) 7 13 13 13 Formula (26.2) 2 2 2 2 Formula (31.1) 3 6 Formula (31.2) 6 6 3 Formula (31.4) 3 3 3 3 Formula (44.1) 5 7 6 6 Formula (44.2) 7 5 3 3 Formula (60.1) 4 4 4 4 Formula (60.12) 4 4 4 4

TABLE 14 Result of Evaluation Exam- Exam- Exam- Exam- Evaluation Item ple 20 ple 21 ple 22 ple 23 T_(NI)/° C. 92.8 98.2 95.1 94.4 Δn 0.109 0.113 0.111 0.111 Δε 12.0 11.7 9.7 9.2 η/mPa · s 17 19 16 16 γ₁/mPa · s 96 108 100 104 Initial Voltage 99.6 99.6 99.5 99.4 Holding Ratio (%) Voltage Holding 98.6 98.6 98.4 98.0 Ratio after Thermal Test (%) Screen Burn-in 620 630 600 580 (h) Droplet Stains 5 5 4 4 Contamination of 200 195 175 165 Manufacturing Equipment (s) Process 1100 1090 990 950 Adaptability (100 Times) Resistance to 625 614 568 524 Resolution at Low Temperature (h)

Examples 24 to 27

Compositions were prepared as shown in Table 15, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 16 shows results of the evaluations of the compositions and liquid crystal displays.

TABLE 15 Ratio (Mass %) Formula of Exam- Exam- Exam- Exam- Compound ple 24 ple 25 ple 26 ple 27 Formula (i.2) 2 3 5 5 Formula (i.3) 5 5 3 3 Formula (i.4) 3 2 2 2 Formula (ii) 11 11 11 11 Formula (2.2) 12 15 27 Formula (2.3) 15 15 Formula (2.4) 12 12 Formula (6.3) 5 5 Formula (6.6) 5 5 Formula (11.1) 15 15 13 11 Formula (11.2) 11 11 13 15 Formula (15.1) 3 Formula (18.1) 3 Formula (19.2) 3 3 Formula (23.1) 5 5 5 5 Formula (23.2) 5 5 5 5 Formula (26.2) 8 8 8 8

TABLE 16 Result of Evaluation Exam- Exam- Exam- Exam- Evaluation Item ple 24 ple 25 ple 26 ple 27 T_(NI)/° C. 104.9 105.6 106.7 105.5 Δn 0.121 0.117 0.119 0.116 Δε 5.5 5.5 5.6 5.8 η/mPa · s 16 14 13 11 γ₁/mPa · s 90 75 78 66 Initial Voltage 99.5 99.5 99.3 99.3 Holding Ratio (%) Voltage Holding 98.3 98.1 97.9 97.8 Ratio after Thermal Test (%) Screen Burn-in 480 470 400 410 (h) Droplet Stains 5 5 4 4 Contamination of 200 190 185 185 Manufacturing Equipment (s) Process 1100 1000 900 880 Adaptability (100 Times) Resistance to 650 600 550 540 Resolution at Low Temperature (h)

Examples 28 to 31

Compositions were prepared as shown in Table 17, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 18 shows results of the evaluations of the compositions and liquid crystal displays.

TABLE 17 Ratio (Mass %) Formula of Exam- Exam- Exam- Exam- Compound ple 28 ple 29 ple 30 ple 31 Formula (i.2) 8 Formula (i.3) 7 9 4 2 Formula (i.4) 3 3 6 Formula (ii) 16 12 10 6 Formula (1.2) 9 10 Formula (2.2) 29 24 35 20 Formula (11.1) 10 6 Formula (11.2) 12 2 6 13 Formula (26.1) 3 6 Formula (26.2) 7 4 10 9 Formula (28.3) 7 5 5 8 Formula (28.5) 5 Formula (31.2) 11 9 8 10 Formula (37.2) 2 1 3 Formula (41.2) 2 1 Formula (44.1) 8 Formula (44.2) 6 3 5

TABLE 18 Result of Evaluation Exam- Exam- Exam- Exam- Evaluation Item ple 28 ple 29 ple 30 ple 31 T_(NI)/° C. 91.3 83.7 82.3 81.6 Δn 0.100 0.105 0.100 0.104 Δε 8.9 9.4 8.7 13.0 η/mPa · s 16 17 15 19 γ₁/mPa · s 91 94 76 80 Initial Voltage 99.5 99.5 99.5 99.5 Holding Ratio (%) Voltage Holding 98.4 98.2 98.5 98.4 Ratio after Thermal Test (%) Screen Burn-in 550 540 560 550 (h) Droplet Stains 5 4 5 4 Contamination of 200 190 210 190 Manufacturing Equipment (s) Process 1090 1000 1070 1002 Adaptability (100 Times) Resistance to 610 585 610 590 Resolution at Low Temperature (h)

Examples 32 to 35

Compositions were prepared as shown in Table 19, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 20 shows results of the evaluations of the compositions and liquid crystal displays.

TABLE 19 Ratio (Mass %) Formula of Exam- Exam- Exam- Exam- Compound ple 32 ple 33 ple 34 ple 35 Formula (i.2) 7 7 Formula (i.3) 8 8 8 Formula (i.4) 7 8 7 Formula (ii) 13 12 11 13 Formula (2.2) 34 35 36 34 Formula (11.1) 8 8 9 Formula (11.2) 16 8 8 Formula (18.4) 1 8 Formula (19.2) 1 1 Formula (26.2) 4 4 4 4 Formula (31.2) 6 6 6 6 Formula (44.1) 4 5 6 4 Formula (44.2) 7 6 5 7

TABLE 20 Result of Evaluation Exam- Exam- Exam- Exam- Evaluation Item ple 32 ple 33 ple 34 ple 35 T_(NI)/° C. 91.8 88.6 88.1 84.8 Δn 0.109 0.107 0.107 0.115 Δε 10.3 10.3 10.1 10.4 η/mPa · s 19 17 17 20 γ₁/mPa · s 99 93 94 101 Initial Voltage 99.5 99.6 99.6 99.5 Holding Ratio (%) Voltage Holding 98.3 98.4 98.4 98.2 Ratio after Thermal Test (%) Screen Burn-in 600 620 610 600 (h) Droplet Stains 5 5 5 4 Contamination of 185 190 190 180 Manufacturing Equipment (s) Process 1050 1100 1110 1000 Adaptability (100 Times) Resistance to 590 600 600 580 Resolution at Low Temperature (h)

Examples 36 to 39

Compositions were prepared as shown in Table 21, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 22 shows results of the evaluations of the compositions and liquid crystal displays.

TABLE 21 Ratio (Mass %) Formula of Exam- Exam- Exam- Exam- Compound ple 36 ple 37 ple 38 ple 39 Formula (i.2) 2 3 5 4 Formula (i.3) 3 2 4 Formula (ii) 10 13 6 16 Formula (2.2) 37 35 42 29 Formula (11.1) 12 8 6 14 Formula (11.2) 4 7 9 2 Formula (15.1) 2 Formula (18.6) 4 Formula (19.2) 4 Formula (19.4) 12 4 8 10 Formula (23.1) 4 Formula (28.3) 2 3 2 2 Formula (31.2) 8 5 10 4 Formula (31.4) 2 2 5 Formula (39.2) 3 Formula (44.1) 4 4 3 6 Formula (44.2) 4 3 5 2

TABLE 22 Result of Evaluation Exam- Exam- Exam- Exam- Evaluation Item ple 36 ple 37 ple 38 ple 39 T_(NI)/° C. 95.1 95.0 98.4 97.6 Δn 0.106 0.106 0.103 0.110 Δε 4.7 4.9 4.8 5.2 η/mPa · s 14 13 14 16 γ₁/mPa · s 60 68 61 75 Initial Voltage 99.5 99.5 99.5 99.5 Holding Ratio (%) Voltage Holding 98.0 98.9 98.2 98.4 Ratio after Thermal Test (%) Screen Burn-in 540 610 540 550 (h) Droplet Stains 5 5 4 4 Contamination of 200 210 200 190 Manufacturing Equipment (s) Process 1000 1020 990 980 Adaptability (100 Times) Resistance to 600 630 590 560 Resolution at Low Temperature (h)

Examples 40 to 43

Compositions were prepared as shown in Table 23, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 24 shows results of the evaluations of the compositions and liquid crystal displays.

TABLE 23 Ratio (Mass %) Formula of Exam- Exam- Exam- Exam- Compound ple 40 ple 41 ple 42 ple 43 Formula (i.2) 5 5 5 5 Formula (ii) 8 8 8 13 Formula (2.2) 11 9 15 Formula (2.3) 11 11 Formula (2.4) 10 10 Formula (3.1) 4 Formula (3.3) 4 4 4 Formula (6.3) 11 10 6 Formula (6.6) 11 5 Formula (11.1) 17 17 13 13 Formula (11.2) 9 9 13 13 Formula (19.2) 1 1 1 2 Formula (23.3) 1 1 Formula (26.2) 9 9 9 9 Formula (31.2) 3 3 3 3 Formula (37.2) 7 7 6 6 Formula (41.2) 1 1 2 2 Formula (44.2) 4 4 4 4

TABLE 24 Result of Evaluation Exam- Exam- Exam- Exam- Evaluation Item ple 40 ple 41 ple 42 ple 43 T_(NI)/° C. 89.9 93.3 94.8 92.8 Δn 0.105 0.106 0.111 0.109 Δε 6.7 6.7 7.2 7.1 η/mPa · s 14 13 18 14 γ₁/mPa · s 70 66 70 62 Initial Voltage 99.4 99.6 99.6 99.4 Holding Ratio (%) Voltage Holding 98.5 98.3 98.3 98.0 Ratio after Thermal Test (%) Screen Burn-in 600 600 600 510 (h) Droplet Stains 5 5 4 4 Contamination of 190 175 180 185 Manufacturing Equipment (s) Process 800 750 1000 700 Adaptability (100 Times) Resistance to 610 600 600 400 Resolution at Low Temperature (h)

Examples 44 to 46

Compositions were prepared as shown in Table 25, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 26 shows results of the evaluations of the compositions and liquid crystal displays.

Comparative Example 4

A composition free from the compound represented by Formula (ii) was prepared as shown in Table 25, and an IPS liquid crystal display having the structure illustrated in FIGS. 1 and 2 was produced. Table 26 shows results of the evaluations of the composition and liquid crystal display.

TABLE 25 Ratio (Mass %) Formula of Exam- Comparative Exam- Exam- Compound ple 44 Example 4 ple 45 ple 46 Formula (i.2) 5 5 Formula (i.3) 5 Formula (i.4) 5 Formula (ii) 5 10 14 Formula (2.2) 43 48 38 34 Formula (5.2) 6 Formula (5.4) 6 6 6 Formula (15.1) 9 9 9 9 Formula (18.3) 8 8 Formula (18.9) 8 8 Formula (26.2) 6 6 6 6 Formula (37.2) 6 6 6 6 Formula (54.2) 7 7 7 5 Formula (54.4) 5 5 5 7

TABLE 26 Result of Evaluation Exam- Comparative Exam- Exam- Evaluation Item ple 44 Example 4 ple 45 ple 46 T_(NI)/° C. 76.4 75.3 80.5 81.1 Δn 0.112 0.111 0.117 0.115 Δε 4.7 4.7 4.3 4.3 η/mPa · s 12 12 14 14 γ₁/mPa · s 44 42 48 51 Initial Voltage 99.4 98.5 99.6 99.4 Holding Ratio (%) Voltage Holding 98.5 95.8 98.1 98.8 Ratio after Thermal Test (%) Screen Burn-in 600 105 600 600 (h) Droplet Stains 5 2 4 5 Contamination of 165 20 160 185 Manufacturing Equipment (s) Process 1010 185 1000 1020 Adaptability (100 Times) Resistance to 610 60 600 610 Resolution at Low Temperature (h)

Examples 47 to 49

Compositions were prepared as shown in Table 27, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 28 shows results of the evaluations of the compositions and liquid crystal displays.

Comparative Example 5

A composition free from the compound represented by Formula (ii) was prepared as shown in Table 27, and an IPS liquid crystal display having the structure illustrated in FIGS. 1 and 2 was produced. Table 28 shows results of the evaluations of the composition and liquid crystal display.

TABLE 27 Ratio (Mass %) Formula of Exam- Exam- Exam- Comparative Compound ple 47 ple 48 ple 49 Example 5 Formula (i.2) 5 5 Formula (i.3) 5 Formula (i.4) 5 Formula (ii) 4 2 6 Formula (2.2) 48 50 46 52 Formula (5.4) 8 8 8 8 Formula (11.2) 7 7 Formula (15.1) 7 7 7 Formula (18.1) 8 8 8 Formula (18.3) 7 7 Formula (18.4) 7 8 Formula (26.2) 4 4 4 4 Formula (39.2) 6 6 6 6 Formula (42.3) 3 3 3 3

TABLE 28 Result of Evaluation Exam- Exam- Exam- Comparative Evaluation Item ple 47 ple 48 ple 49 Example 5 T_(NI)/° C. 75.1 74.5 81.2 74.9 Δn 0.12 0.120 0.115 0.114 Δε 4.6 4.5 4.1 4.6 η/mPa · s 13 14 14 14 γ₁/mPa · s 44 43 43 41 Initial Voltage 99.6 99.6 99.4 97.5 Holding Ratio (%) Voltage Holding 98.7 98.7 98.4 94.0 Ratio after Thermal Test (%) Screen Burn-in 480 470 390 60 (h) Droplet Stains 5 5 4 1 Contamination of 175 170 175 15 Manufacturing Equipment (s) Process 980 900 745 84 Adaptability (100 Times) Resistance to 540 500 360 50 Resolution at Low Temperature (h)

Examples 50 to 54

Compositions were prepared as shown in Table 29, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 30 shows results of the evaluations of the compositions and liquid crystal displays.

TABLE 29 Ratio (Mass %) Formula of Exam- Exam- Exam- Exam- Exam- Compound ple 50 ple 51 ple 52 ple 53 ple 54 Formula (i.2) 2 2 3 4 2 Formula (ii) 9 9 15 22 30 Formula (2.2) 28 38 28 15 Formula (2.3) 7 Formula (11.1) 16 15 14 13 17 Formula (11.2) 14 5 10 17 13 Formula (26.1) 2 3 1 5 7 Formula (26.2) 12 11 10 4 8 Formula (28.3) 7 8 9 10 6 Formula (41.2) 1 1 1 1 1 Formula (44.1) 3 3 2 5 4 Formula (44.2) 6 5 7 4 5

TABLE 30 Result of Evaluation Exam- Exam- Exam- Exam- Exam- Evaluation Item ple 50 ple 51 ple 52 ple 53 ple 54 T_(NI)/° C. 90.0 75.9 88.4 101.6 96.4 Δn 0.105 0.096 0.101 0.107 0.112 Δε 7.0 6.7 6.7 6.6 6.4 η/mPa · s 17 14 15 17 18 γ₁/mPa · s 60 41 52 68 68 Initial Voltage 99.3 99.1 99.3 99.5 99.5 Holding Ratio (%) Voltage Holding 98.5 98.0 98.4 98.8 98.8 Ratio after Thermal Test (%) Screen Burn-in 600 490 580 630 625 (h) Droplet Stains 5 4 4 5 5 Contamination of 200 180 190 210 210 Manufacturing Equipment (s) Process 1000 800 900 1005 1010 Adaptability (100 Times) Resistance to 600 590 585 470 450 Resolution at Low Temperature (h)

Examples 55 to 58

Compositions were prepared as shown in Table 31, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 32 shows results of the evaluations of the compositions and liquid crystal displays.

TABLE 31 Ratio (Mass %) Formula of Exam- Exam- Exam- Exam- Compound ple 55 ple 56 ple 57 ple 58 Formula (i.2) 5 5 5 Formula (i.3) 5 Formula (ii) 15 12 12 15 Formula (2.2) 34 37 37 32 Formula (5.2) 12 12 10 Formula (5.4) 12 4 Formula (10.2) 8 8 4 8 Formula (11.2) 4 Formula (18.1) 7 7 7 Formula (18.4) 8 8 Formula (18.6) 8 8 7 Formula (26.1) 5 5 Formula (26.2) 5 5 Formula (39.2) 6 6 6 6

TABLE 32 Result of Evaluation Exam- Exam- Exam- Exam- Evaluation Item ple 55 ple 56 ple 57 ple 58 T_(NI)/° C. 75.3 76.5 75.2 76.0 Δn 0.121 0.122 0.126 0.127 Δε 3.9 3.8 3.9 3.7 η/mPa · s 11 11 12 13 γ₁/mPa · s 42 41 42 44 Initial Voltage 99.7 99.4 99.6 99.6 Holding Ratio (%) Voltage Holding 99.2 98.2 97.1 99.2 Ratio after Thermal Test (%) Screen Burn-in 640 280 250 625 (h) Droplet Stains 5 4 3 5 Contamination of 220 165 170 230 Manufacturing Equipment (s) Process 1100 1000 850 1060 Adaptability (100 Times) Resistance to 615 600 600 610 Resolution at Low Temperature (h)

Examples 59 to 61

Compositions were prepared as shown in Table 33, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 34 shows results of the evaluations of the compositions and liquid crystal displays.

Comparative Example 6

A composition free from the compound represented by Formula (ii) was prepared as shown in Table 33, and an IPS liquid crystal display having the structure illustrated in FIGS. 1 and 2 was produced. Table 34 shows results of the evaluations of the composition and liquid crystal display.

TABLE 33 Ratio (Mass %) Formula of Exam- Exam- Exam- Comparative Compound ple 59 ple 60 ple 61 Example 6 Formula (i.2) 4 Formula (i.3) 4 4 Formula (i.4) 4 Formula (ii) 7 7 4 Formula (2.2) 41 35 44 44 Formula (9.2) 6 4 Formula (11.1) 11 11 6 Formula (11.2) 11 5 Formula (18.1) 11 11 11 7 Formula (18.6) 11 11 7 Formula (18.9) 11 8 Formula (26.2) 9 9 9 9 Formula (36.2) 6 6 Formula (41.2) 6 6

TABLE 34 Result of Evaluation Exam- Exam- Exam- Comparative Evaluation Item ple 59 ple 60 ple 61 Example 6 T_(NI)/° C. 80.8 82.7 73.6 74.0 Δn 0.116 0.119 0.120 0.123 Δε 4.3 4.3 5.1 4.8 η/mPa · s 12 13 13 14 γ₁/mPa · s 45 48 48 48 Initial Voltage 99.6 99.3 99.5 98.6 Holding Ratio (%) Voltage Holding 98.8 98.0 98.8 96.2 Ratio after Thermal Test (%) Screen Burn-in 650 475 615 60 (h) Droplet Stains 5 4 5 1 Contamination of 205 185 195 110 Manufacturing Equipment (s) Process 965 930 1000 175 Adaptability (100 Times) Resistance to 680 645 620 90 Resolution at Low Temperature (h)

Examples 62 to 65

Compositions were prepared as shown in Table 35, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 36 shows results of the evaluations of the compositions and liquid crystal displays.

TABLE 35 Ratio (Mass %) Formula of Exam- Exam- Exam- Exam- Compound ple 62 ple 63 ple 64 ple 65 Formula (i.2) 5 5 5 5 Formula (ii) 15 14 10 10 Formula (1.2) 4 4 Formula (2.2) 34 35 30 30 Formula (3.1) 5 5 Formula (5.2) 10 10 10 5 Formula (5.4) 5 Formula (11.1) 8 8 8 8 Formula (18.1) 8 8 8 8 Formula (18.4) 10 10 10 10 Formula (26.1) 5 5 5 5 Formula (37.2) 5 5 5 Formula (39.2) 5

TABLE 36 Result of Evaluation Exam- Exam- Exam- Exam- Evaluation Item ple 62 ple 63 ple 64 ple 65 T_(NI)/° C. 75.3 78.1 76.2 77.3 Δn 0.121 0.119 0.117 0.109 Δε 3.9 3.8 3.8 3.7 η/mPa · s 12 11 11 11 γ₁/mPa · s 41 39 37 39 Initial Voltage 99.8 99.4 99.1 99.2 Holding Ratio (%) Voltage Holding 99.0 98.7 98.1 98.1 Ratio after Thermal Test (%) Screen Burn-in 650 620 560 480 (h) Droplet Stains 5 5 4 4 Contamination of 210 165 150 150 Manufacturing Equipment (s) Process 1010 950 880 790 Adaptability (100 Times) Resistance to 630 630 600 600 Resolution at Low Temperature (h)

Examples 66 to 69

Compositions were prepared as shown in Table 37, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 38 shows results of the evaluations of the compositions and liquid crystal displays.

TABLE 37 Ratio (Mass %) Formula of Exam- Exam- Exam- Exam- Compound ple 66 ple 67 ple 68 ple 69 Formula (i.2) 4 5 Formula (i.4) 5 4 Formula (ii) 17 15 13 14 Formula (2.2) 39 37 43 40 Formula (11.1) 5 5 Formula (11.2) 8 4 Formula (26.2) 8 6 8 10 Formula (28.3) 2 3 2 Formula (31.1) 6 5 Formula (31.2) 6 7 Formula (37.2) 3 4 Formula (38.2) 5 6 5 6 Formula (39.2) 6 7 3 4 Formula (44.1) 4 3 4 3 Formula (44.2) 4 3 4 5

TABLE 38 Result of Evaluation Exam- Exam- Exam- Exam- Evaluation Item ple 66 ple 67 ple 68 ple 69 T_(NI)/° C. 85.3 92.2 85.3 84.2 Δn 0.099 0.100 0.097 0.100 Δε 8.5 8.0 7.5 9.0 η/mPa · s 15 16 15 16 γ₁/mPa · s 83 88 85 90 Initial Voltage 99.5 99.5 99.4 99.5 Holding Ratio (%) Voltage Holding 98.5 98.4 98.0 98.4 Ratio after Thermal Test (%) Screen Burn-in 645 630 600 620 (h) Droplet Stains 5 5 4 5 Contamination of 175 175 150 170 Manufacturing Equipment (s) Process 1100 1100 1050 1090 Adaptability (100 Times) Resistance to 650 620 600 640 Resolution at Low Temperature (h)

Examples 70 to 72

Compositions were prepared as shown in Table 39, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 40 shows results of the evaluations of the compositions and liquid crystal displays.

Comparative Example 7

A composition free from the compound represented by Formula (ii) was prepared as shown in Table 39, and an IPS liquid crystal display having the structure illustrated in FIGS. 1 and 2 was produced. Table 40 shows results of the evaluations of the composition and liquid crystal display.

TABLE 39 Ratio (Mass %) Formula of Exam- Exam- Comparative Exam- Compound ple 70 ple 71 Example 7 ple 72 Formula (i.2) 4 4 4 4 Formula (ii) 8 8 12 Formula (1.2) 8 Formula (2.2) 16 16 Formula (2.3) 16 16 Formula (5.3) 5 5 5 5 Formula (11.1) 14 14 13 10 Formula (11.2) 13 13 14 13 Formula (23.1) 3 3 3 Formula (23.2) 3 3 3 6 Formula (26.1) 7 5 Formula (26.2) 14 7 9 14 Formula (34.1) 8 Formula (37.2) 2 1 2 2 Formula (41.2) 1 Formula (44.1) 4 4 4 4 Formula (44.2) 6 6 6 6 Formula (51.1) 8 8 8

TABLE 40 Result of Evaluation Exam- Exam- Comparative Exam- Evaluation Item ple 70 ple 71 Example 7 ple 72 T_(NI)/° C. 102.8 101.6 99.0 104.8 Δn 0.123 0.124 0.121 0.118 Δε 9.8 10.1 9.9 11.2 η/mPa · s 17 15 15 16 γ₁/mPa · s 96 87 84 84 Initial Voltage 99.0 99.1 97.9 99.0 Holding Ratio (%) Voltage Holding 98.2 98.3 94.5 98.1 Ratio after Thermal Test (%) Screen Burn-in 600 610 50 600 (h) Droplet Stains 4 4 1 4 Contamination of 200 205 45 200 Manufacturing Equipment (s) Process 1000 1000 150 1000 Adaptability (100 Times) Resistance to 550 600 72 600 Resolution at Low Temperature (h)

Examples 73 to 75

Compositions were prepared as shown in Table 41, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 42 shows results of the evaluations of the compositions and liquid crystal displays.

Comparative Example 8

A composition free from the compound represented by Formula (ii) was prepared as shown in Table 41, and an IPS liquid crystal display having the structure illustrated in FIGS. 1 and 2 was produced. Table 42 shows results of the evaluations of the composition and liquid crystal display.

TABLE 41 Ratio (Mass %) Formula of Exam- Exam- Comparative Exam- Compound ple 73 ple 74 Example 8 ple 75 Formula (i.2) 5 5 Formula (i.3) 5 5 Formula (ii) 7 7 12 Formula (1.2) 7 Formula (2.2) 25 25 25 20 Formula (11.1) 16 16 10 16 Formula (11.2) 8 14 8 Formula (19.2) 8 Formula (26.2) 12 12 12 12 Formula (28.3) 10 10 10 10 Formula (28.5) 4 4 4 4 Formula (44.1) 3 3 3 Formula (44.2) 5 5 8 5 Formula (54.2) 5 5 5 Formula (56.2) 5

TABLE 42 Result of Evaluation Exam- Exam- Comparative Exam- Evaluation Item ple 73 ple 74 Example 8 ple 75 T_(NI)/° C. 85.3 83.4 85.0 85.9 Δn 0.105 0.118 0.103 0.105 Δε 9.3 9.7 9.6 9.4 η/mPa · s 16 20 15 17 γ₁/mPa · s 87 92 77 96 Initial Voltage 99.5 99.5 98.5 99.5 Holding Ratio (%) Voltage Holding 98.5 98.4 96.8 98.1 Ratio after Thermal Test (%) Screen Burn-in 650 600 125 350 (h) Droplet Stains 4 4 1 4 Contamination of 200 190 50 180 Manufacturing Equipment (s) Process 1000 900 800 700 Adaptability (100 Times) Resistance to 600 550 500 400 Resolution at Low Temperature (h)

Examples 76 to 78

Compositions were prepared as shown in Table 43, and IPS liquid crystal displays having the structure illustrated in FIGS. 1 and 2 were produced. Table 44 shows results of the evaluations of the compositions and liquid crystal displays.

Comparative Example 9

A composition free from the compound represented by Formula (ii) was prepared as shown in Table 43, and an IPS liquid crystal display having the structure illustrated in FIGS. 1 and 2 was produced. Table 44 shows results of the evaluations of the composition and liquid crystal display.

TABLE 43 Ratio (Mass %) Formula of Exam- Comparative Exam- Exam- Compound ple 76 Example 9 ple 77 ple 78 Formula (i.2) 5 Formula (i.3) 5 5 5 Formula (ii) 7 6 7 Formula (2.2) 49 56 50 49 Formula (19.2) 5 5 5 5 Formula (19.4) 2 Formula (19.10) 2 2 2 Formula (26.2) 8 8 8 8 Formula (36.1) 3 3 4 Formula (36.2) 4 4 3 4 Formula (41.2) 3 Formula (44.21) 4 5 4 4 Formula (44.22) 4 4 4 4 Formula (60.1) 4 4 5 4 Formula (60.2) 5 4 4 5

TABLE 44 Result of Evaluation Exam- Comparative Exam- Exam- Evaluation Item ple 76 Example 9 ple 77 ple 78 T_(NI)/° C. 80.7 78.4 79.7 77.5 Δn 0.113 0.112 0.113 0.115 Δε 7.5 7.7 7.5 7.8 η/mPa · s 11 10 10 11 γ₁/mPa · s 61 59 61 62 Initial Voltage 99.4 98.9 99.6 99.4 Holding Ratio (%) Voltage Holding 98.8 95.5 98.9 98.8 Ratio after Thermal Test (%) Screen Burn-in 620 66 610 615 (h) Droplet Stains 4 1 4 4 Contamination of 155 12 140 150 Manufacturing Equipment (s) Process 850 100 800 820 Adaptability (100 Times) Resistance to 600 90 600 600 Resolution at Low Temperature (h)

Each of the liquid crystal compositions prepared in Examples had a low viscosity and a good resistance to resolution at low temperature. The liquid crystal composition was less volatile and thus contributed to a reduction in contamination of equipment. Furthermore, a variation in the amount of the droplets of the liquid crystal composition in an ODF process was able to be reduced, which enabled stable production of liquid crystal displays for a long time. Moreover, each of the liquid crystal displays produced in Examples had an excellent thermal resistance and therefore had display properties stably maintained for a long time.

INDUSTRIAL APPLICABILITY

The liquid crystal composition of the present invention with positive dielectric anisotropy has a good resistance to resolution at low temperature, and changes in its specific resistance and voltage holding ratio due to exposure to heat or light are significantly small; hence, products produced therefrom are highly practical, and liquid crystal display devices using such a liquid crystal composition can quickly respond. In addition, since the liquid crystal composition can be continuously and stably dropped in a process for manufacturing liquid crystal display devices, defective display resulting from the manufacturing process can be reduced, and the liquid crystal display devices can be produced in a high yield; thus, such a liquid crystal composition is highly useful.

REFERENCE SIGNS LIST

-   -   100 First substrate     -   102 TFT layer     -   103 Pixel electrode     -   104 Passivation film     -   105 First alignment film     -   200 Second substrate     -   201 Planarization film     -   202 Black matrix     -   203 Color filter     -   204 Transparent electrode     -   205 Second alignment film     -   301 Sealing material     -   302 Protrusion (columnar spacer)     -   303 Liquid crystal layer     -   304 Protrusion (columnar spacer)     -   401 Mask pattern     -   402 Resin layer 

The invention claimed is:
 1. A liquid crystal composition comprising: at least one compound represented by General Formula (i)

where R^(i) represents an alkyl group having 1 to 5 carbon atoms; a compound represented by Formula (ii)

compounds represented by General Formulae (44.1) and (44.2)

at least one compound represented by General Formula (X-3-1)

where R¹⁰ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; and compounds represented by General Formulae (11.1) and (11.2)

wherein the total amount of the compounds represented by General Formulae (44.1) and (44.2) is in the range of 6 to 12 mass % relative to the total mass of the liquid crystal composition, and the total mass of the compounds represented by General Formulae (11.1) and (11.2) is in the range of 21 mass % to 35 mass % relative to the total mass of the liquid crystal composition.
 2. The liquid crystal composition according to claim 1, wherein the amount of the compound represented by Formula (ii) is at least 14 mass % relative to the total mass of the liquid crystal composition.
 3. The liquid crystal composition according to claim 1, wherein a compound represented by Formula (i.4) is used as the at least one compound represented by General Formula (i)

and the amount of the compound represented by Formula (i.4) is at least 8 mass % relative to the total mass of the liquid crystal composition.
 4. The liquid crystal composition according to claim 1, further comprising at least one compound represented by General Formula (L) R^(L1)—B^(L1)-L^(L1)-B^(L2)

L^(L2)-B^(L3)

_(OL)R^(L2)  (L) where R^(L1) and R^(L2) each independently represent an alkyl group having 1 to 8 carbon atoms, and one —CH₂— moiety or at least two —CH₂— moieties not adjoining each other in the alkyl group are each independently optionally substituted with —CH═CH—, —C≡C—, —O—, —CO—, —COO—, or —OCO—; OL represents 0, 1, 2, or 3; B^(L1), B_(L2), and B^(L3) each independently represent a group selected from the group consisting of (a) a 1,4-cyclohexylene group (of which one —CH₂— moiety or at least two —CH₂— moieties not adjoining each other are optionally substituted with —O—) and (b) a 1,4-phenylene group (of which one —CH═ moiety or at least two —CH═ moieties not adjoining each other are optionally substituted with —N═), and the groups (a) and (b) are each independently optionally substituted with a cyano group, a fluorine atom, or a chlorine atom; L^(L1) and L^(L2) each independently represent a single bond, —CH₂CH₂—, —(CH₂)₄—, —OCH₂—, —CH₂O—, —COO—, —OCO—, —OCF₂—, —CF₂O—, —CH═N—N═CH—, —CH═CH—, —CF═CF—, or —C≡C—; in the case where OL is 2 or 3 and where L^(L2) is multiple, the L^(L2) moieties are the same as or different from each other; in the case where OL is 2 or 3 and where B^(L3) is multiple, the B^(L3) moieties are the same as or different from each other; and the compound represented by General Formula (L) excludes the compound represented by Formula (ii).
 5. The liquid crystal composition according to claim 1, further comprising at least one compound represented by General Formula (M)

where R^(M1) represents an alkyl group having 1 to 8 carbon atoms, and one —CH₂— moiety or at least two —CH₂— moieties not adjoining each other in the alkyl group are each independently optionally substituted with —CH═CH—, —C≡C—, —O—, —CO—, —COO—, or —OCO—; PM represents 0, 1, 2, 3, or 4; C^(M1) and C^(M2) each independently represent a group selected from the group consisting of (d) a 1,4-cyclohexylene group (of which one —CH₂— moiety or at least two —CH₂— moieties not adjoining each other are optionally substituted with —O— or —S—) and (e) a 1,4-phenylene group (of which one —CH═ moiety or at least two —CH═ moieties not adjoining each other are optionally substituted with —N═), and the groups (d) and (e) are each independently optionally substituted with a cyano group, a fluorine atom, or a chlorine atom; K^(M1) and K^(M2) each independently represent a single bond, —CH₂CH₂—, —(CH₂)₄—, —OCH₂—, —CH₂O—, —OCF₂—, —CF₂O—, —COO—, —OCO—, or —C≡C—; in the case where PM is 2, 3, or 4 and where K^(M1) is multiple, the K^(M1) moieties are the same as or different from each other; in the case where PM is 2, 3, or 4 and where C^(M2) is multiple, the C^(M2) moieties are the same as or different from each other; X^(M1) and X^(M3) each independently represent a hydrogen atom, a chlorine atom, or a fluorine atom; X^(M2) represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group; and the compound represented by General Formula (M) excludes the compound represented by General Formula (i).
 6. A liquid crystal display device comprising the liquid crystal composition according to claim
 1. 7. The liquid crystal display device according to claim 6, wherein the liquid crystal display device is operated in an IPS mode, an OCB mode, an ECB mode, a VA mode, a VA-IPS mode, or an FFS mode.
 8. A liquid crystal display comprising the liquid crystal display device according to claim
 6. 9. The liquid crystal composition according to claim 1, further comprising a compound represented by formula (V-2-1) or (V-2-2),

where R⁵¹ and R⁵² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.
 10. The liquid crystal composition according to claim 9, wherein further the compound represented by formula (V-2-1) or (V-2-2) is selected from the group consisting of formulae (23.1), (23.2), (23.3), (23.4), 24.1), (24.2), 24.3), and (24.4) 